英语句子中如何正确使用逗号
在英语写作练习中，标点符号是最容易被忽视的一个问题。有的学生整篇文章一逗到底；有的则相反，全文都用句号。这样，无论文章的内容多好，结构多紧凑，逻辑性多强，但由于标点符号错误过多，文章变得不知所云。逗号是最常用的标点符号之一，也是使用中出现错误最多的。典型错误如：
* He promised to come to the meeting,however,he didn't appear.他答应来开会，但是没有来。（however之前不能用逗号，应该是分号。）
* I didn't know,where I should go.我不知道我该去哪。（where 之前的逗号应该去掉。）
* We realized,that the girl was a foreigner.我们了解到那个女孩是个外国人。（that之前的逗号应该去掉。）
那末，如何正确使用逗号呢？
1.逗号用来隔开句中的并列成分，在最后两个成分之间的连接词之前，一般不用逗号；但如果最后两个成分太长，最好用逗号隔开，以免引起歧义。例如：
The children sang,danced,jumped and chased each other.孩子们唱歌、跳舞、欢跃，互相追逐。
I spent yesterday playing basketball,drinking beer,and tellingstories.我在打篮球、喝啤酒和讲故事中度过了昨天。
2.逗号用来连接并列分句，用在连接词and,but,or,for,so,nor,yet
等之前。例如：
He wanted to go on,but other people disagreed.他想继续，但其他人不同意。
The young man tried,yet he failed to convince her.这个年轻人试图说服她，但是失败了。
但应注意：在汉语中，单独的逗号可以连接分句；在英语中，一般来说逗号必须与连接词一起才能连接并列分句，否则是错误的。
3.句中的名词性从句（如由that,what,where,when,if等引导）作动词的宾语时，该从句之前不用逗号。例如：
Tell me what you are going to do.告诉我你打算干什么。
Tom wondered if the dinner was ready.汤姆不知道晚餐准备好了没有。
4.状语从句、介词短语或分词短语在句中作状语，放在主语之前或插在句中，其后应该用逗号，若置于主句之后，则不用逗号。例如：Some listeners,bored by the lengthy talk,closed their eyesand dozed off.有些听众，由于厌烦那冗长的谈话，闭起眼睛打盹儿。
To my delight,he passed the entrance examination of our institute.使我高兴的是，他通过了我们学院的入学考试。
Come and look me up if you are ever in Beijing.如果你什么时候来北京，就来看我。
5.句中如有限制性从句或词组（即需要用从句给修饰词以明确的含义）时，不用逗号；如果是非限制性从句或词组，则需要用逗号把它与
句子的其他部分隔开。例如：
This is the lab where students listen to tapes and see films.这是学生们听磁带、看电影的实验室。
Mr.Li,the new CEO of the company,will soon announce his plansfor reforms.李先生，该公司的新任首席执行官，不久将宣布他
的改革计划。
6.当修饰全句的状语置于动词各部分之间，或主语与动词之间，或
动词与补语之间时，用逗号把它和句子的其他成分隔开。例如：
My father had,surprisingly,kept his temper all day.我父亲整天
都不发脾气，这让人感到意外。
They were,believe it or not,in love with each other.信不信由
你，他们在相爱。
7.逗号把同位语、插入语、独立成分与句中的其他成分隔开。例如：
This is Zhang Hong,monitor of Class 1.这是张红，一班的班长。
The machines you have supplied us with,I'm glad to tell you,work very well.我高兴地告诉你，你提供给我们的机器很好用。
Many interesting places in Beijing,such as the Summer Palaceand Temple of Heaven,attract thousands of visitors daily.北京许多好玩的地方，如颐和园和天坛，每天都吸引着成千上万的参观
者。
"Tell me."he said,"w hat did you think of the discussion?"“告
诉我”，他说，“你认为这个讨论会怎么样？”
8.英语中的日期、地址及四位数以上的数字表达中，逗号也是很重
要的，如果表达日期的顺序是month→day→year，在年之前必须用逗
号。例如：
Hongkong was returned to China on July 1,1997.香港于1997年7月1日回归中国。
如果日期的顺序是：day→month→year.则没有必要用逗号。例如：The girl was born on 15 May 1991.这女孩出生于1991年5月15日。
在表达四位数以上的数字时，为了便于读数，一般从右向左，每三位数之间用逗号隔开。例如：
67,865,243 1,876,468,200
地址表达的例子如下：
My address is "52 Yingzi Lane,Xidan,Beijing."我的地址是“北京西单樱子胡同52号。”
9.如果句中出现
therefore,however,nonetheless,hence,otherwise,besides,moreo ver等连接副词时，它们不能用作连接词来连接两个并列分句。许多学生常常把这些词误用为连词，之前用逗号，这是不对的，应该用分号。例如：
Our monitor didn't hear the report;therefore,he didn't knowwhat new decisions were made.我们班长没有听报告。因此，他不知道所做的新决定是什么。
以上对逗号的种种用法作了简单的分析。标点的正确使用会使文章表达清晰，通顺易懂。因此，逗号这个看似简单却常常被人忽视的小问题，应该受到人们的重视。
[精华] 英文标点符号的使用 https://www.doczj.com/doc/e91630285.html, 作者:Nicole Chan发表于：2005-11-06 01:09:30 【发表评论】【查看原文】【English Forum讨论区】【关闭】 句点（Full Stop / Period，“.”） 问号（Question Mark，“？”） 感叹号（Exclamation Mark，“!”） 逗点（Comma，“,”） 冒号（Colon，“:”） 分号（Semicolon，“;”） 连字符（Hyphen，“-”） 连接号（En Dash，“–”） 破折号（Em Dash，“—”） 括号（Parentheses，小括号“()”；中括号“[]”；大括号“{}”） 引号（Quotation Marks，双引号“"”；单引号“‘”） 缩写及所有格符号（Apostrophe，“‘”） 一、.句点 1.句点用于当一句话完全结束时。 2.句点也可以用于英文单词的缩写，如 Mrs., Dr., P.S. 等。但要注意的是当缩写的字母形成了一个单词的时候就不要使用句点。 如 IBM, DNA 等。 二、？问号 问号要用在一个直接的问句，而不是间接的。 如 How will you solve the problem？是正确的用法，但用在 I wonder how you will solve the problem？就不对了，应该使用句点而不是问号。 另外，在客气的用语中，也是用句点而不是问号. 如 Will you please give me a call tomorrow. 三、! 感叹号 感叹号用于感叹和惊叹的陈述中，在商业写作中要注意感叹号的应用，因为不恰当的使用会显得突兀及不稳重。 四、；分号 1.与中文一样，分号用于分隔地位平等的独立子句。在某些情况下，使用分号比使用句点更显出子句之间的紧密联系，另外分号也经常与连接副词 thus, however, therefore一起使用(放在这些词语之前)。 如 I realize I need exercise; however, I’ll lie down first to think about it. 2.在句子中如果已经使用过逗点，为了避免歧义的产生，就用分号来分隔相似的内容。 如 The employees were Tom Hanks, the manager; Jim White, the engineer; and Dr. Jack Lee. 需要注意的是：一个完整的句子以大写字母开始，以句点结束。写英文时用逗点代替句点、分号、冒号或破折号叫“逗号错”，这正是中国学生所要避免的。请比较下列例句：
浅谈逗号的语用作用 有时，一个小小的逗号会直接影响到句子的结构，甚至句子的意义，在通过语境对语法知识的运用考查时，逗号的作用显得更为重要。现在高考题中对逗号的考查已成为了“热点”，因此有必要对逗号的用法做一个小结。 1．用来分开由并列连词（如：and, but, so, or, for, yet, nor等）连接的句子。如： a. Swimming is the best sport in summer, and people go swimming in rivers and lakes. b. We have won great victories, yet more serious struggles are still ahead of us. 若各句之间的关系紧凑，就可以不用连词，而只用逗号分开。如： a. The older child is a boy, the younger one is a girl. b. He slipped away, nobody knew when. 解题指导：当发现分句中有并列连词（常见的有and, but, so, or, for等）时，首先要弄清它们连接的是词与词、词组与词组、还是句子与句子，然后再利用平行结构解题。有时用来连接两个句子时中间不用逗号。如： Would you like a cup of tea or shall we get down to business right away? (NMET 1995，第36小题) 2．用于分隔主句与放在主句之前的状语（介词短语、分词短语、独立主格结构等）或状语从句。如： a. In the middle of the room, there was a big, beautiful Christmas tree. b. Being careless, he often makes mistakes. c. Lost in thought, he almost ran into the car in front of him. (NMET 1996, 第23小 题) d. While the teacher explained the text, the students listened attentively and took notes. 解题指导：主句之前的部分，不论是短语作状语，还是从句作状 语，它们都只是主句的一个辅加成分，不能单独成句。逗号连接的部分，其中一部分是句子，而另一部分也是句子形式，则按以下思路解题：“若是从句，就不能缺少连词；若无连词，就是独立主格结构。” 如： There being little time left, he left for the station in a hurry. Because there was little time left, he left for the station in a hurry. ______, Mother will wait for him to have dinner together. (NMET 1997 第21 小题) A. However late is he B. However he is late C. However is he late D. However late he is 此句中，依据选项应为从句，并在此基础上对的用法和从句中的语序进行了考
批改网如何粘贴英语作文 如果进JS修改，对小白来说密密麻麻的代码简直像天书，这里 有一个更加简单的方法： <1>打开批改网写作文的页面，点击F12，出现代码编辑区 <2>点击菜单栏最后一行的“Console”,把 “$('#contents').unbind();”复制粘贴到下面的代码区，敲回车，搞定 再次复制粘贴试试 妈妈再也不用担心我的学习 这个更加简单粗暴，把需要粘贴的内容先复制粘贴到标题栏里(标题栏批改网是不禁用粘贴功能的)，然后control+A全选，直接 用鼠标拖拽到正文栏，搞定 Nothingsucceedswithoutastrongwill.没有毅力则一事无成。 thehumoroussaying,'Quittingsmokingistheeasiestthinginthe world.I'vedoneithundredsoftime.'tellsusthatwithoutastrongwi ll,nothingsucceeds,peopletrytoquitsmothingforhundredsoftime sbutendupwithfailurejustbecausetheylaceofastrongwill.Astron glisimportanttousifwewanttoachieveourgoals.everysuccesswill meetmanydifficultyandsetbacks.soweneedtoovercomethemwithour strongwill.ifwesticktoourgoalswithastrongwillandnevergiveit up.atlastwewillbesuccessful.weallbelievethatwithastrongwill ,everyonecansucceed. 看过批改网如何粘贴英语作文的人还看了：
逗号的作用 1.把非谓语动词做伴随状语的部分，用逗号和句子的其他部分分开。2）非谓语动词中分词的独立结构，用逗号和句子的其他部分分开。eg.The content of tomato sauce cooked in an iron pot for three hours showed a striking increase,the level going up nearly 30 times.在这里the level going up nearly 30 times做独立结构，用逗号和句子的其他部分分开。3）分词短语可做非限定性定语(非限定性定语从句起补充说明作用，缺少也不会影响全句的理解，在非限定性定语从句的前面往往有逗号隔开，如若将非限定性定语从句放在句子中间，起前后都需要用逗号隔开。 1.限定性定语从句: 从句不能省略,如果省略整个句子意思不完整。 非限定性定语从句: 从句可以省略,如果省略整个句子意思仍然完整。 2.限定性定语从句: 先行词可以用that 引导。 非限定性定语从句: 先行词不可以用that 引导。 3.限定性定语从句: 引导词有时可以省略。 非限定性定语从句:引导词不可以省略。 4.限定性定语从句:主句与从句不需要用逗号隔开。 非限定性定语从句:主句与从句需要用逗号隔开。 5.限定性定语从句: 从句只修饰先行词。 非限定性定语从句:从句既可以修饰先行词，也可以修饰整个句子或句子的一部分。)，用逗号和句子的其他部分分开。eg.But the buffalo nickel,produced from 1931to 1938,honored a pair of connected tragedies from the settlement of the American frontier---------.在这里produced from 1931to 1938做非限定性定语，修饰the buffalo nickel，用逗号和句子的其他部分分开。4）在状语从句中，用逗号把从句和主句分开。5）把两个用and或but连接的完整句子，用逗号在and或but前分开。6）把两个或两个以上并列的平行成分，用逗号隔开。I reach for the light switch,and as it silently lights the scene,I return to bed to observe the patient with an unemotional,medical eye.在这里第一个逗号是and 连接两个完整的句子，第二个逗号是把as 引导的时间状语从句的从句和主句分开，第三个逗号是把两个或两个以上并列的平行成分，用逗号隔开。7）在非限定性定语从句中，用逗号把从句和主句分开。eg.The only light in her room is coming from a piece of medical equipment,which is flashing its red light sa if in warning.8）把插入语，用逗号和句子的其他部分分开。eg.And people who are likely to have low iron should avoid drinking coffee and tea with meals,she says,since substances in these drinks can interfere with iron being absorbed into the body. she says是插入语。9）把句子的同位语，用逗号和它前面所解释的名词或名词词组分开。eg.The first and most common is having low iron reserves,a condition that tapically has no symptoms.在这里a condition ---做同位语解释low iron reserves，用
中英文标点符号的读法用法大全 ⒈ 汉语中的某些标点符号为英语所没有。 ⑴ 顿号（、）：顿号在汉语中起分割句子中的并列成分的作用；英语中没有顿号，分割句中的并列成分多用逗号。如： She slowly, carefully, deliberately moved the box. 注意：类似的情况下，最后一个逗号后可加and，这个逗号也可省略--She slowly, carefully(,) and deliberately moved the box. ⑵ 书名号（《》）：英文没有书名号，书名、报刊名用斜体或者下划线表示。如： Hamlet / Hamlet 《哈姆雷特》 Winter's Tale / Winter's Tale 《冬天的童话》 The New York Times / The New York Times 《纽约时报》 另外，英语中文章、诗歌、乐曲、电影、绘画等的名称和交通工具、航天器等的专有名词也常用斜体来表示。 ⑶ 间隔号（?）：汉语有间隔号，用在月份和日期、音译的名和姓等需要隔开的词语的正中间，如"一二?九"、"奥黛丽?赫本（人名）"等。英语中没有汉语的间隔号，需要间隔时多用逗号。 ⑷ 着重号：有时汉语用在文字下点实心圆点表示需要强调的词语，这些实心点就是着重号。而英语中没有这一符号，需强调某些成分时可借助文字斜体、某些强调性词汇、特殊句型、标点停顿等多种方法。 ⒉ 英语中的某些标点符号为汉语所没有。 ⑴ 撇号--Apostrophe（'）：该符号主要表示?所有格，如Shakespear's plays / the boy's book；?数字、符号、字母或词形本身的复数，如The teacher had only four A's in his cl ass.; ?省略了字母、数字或单词，如let's（=let us）/ I've（=I have）。 ⑵ 连字号--Hyphen（-）：该符号主要用于以下几种情况。?复合词，如world- famous。?派生词的词缀与词根或词之间，如co-worker。?两个比分、比赛对手、地名、人名、数字之间，可视情况译为"比""对""至"等。?单词移行，把在一行写不开的单词按音节移到下一行，但必须注意：a. 单音节词不移行。 b. 曲折变化后的词尾，如-er/-or/-ing等一般不移行。c. 数字、缩略词不宜移行。 d. 易引起歧义的词不移行，如legend不宜移行为leg-end。 e. 移行后行尾不宜只剩一个字母，如alone不宜移为a-lone。 f. 带词缀的词应在词缀和词根处移行，如disappear移为dis-appear。 g. 复合词在复合成分之间移行，如heartsick移为heart-sick。 ⑶ 斜线号--Virgule或Slash（/）：该符号主要起分割作用，如It could be for staff and / or students. 也常用于标音，如bed /bed/。 ⒊ 某些符号在汉英两种语言中的形式不同。 ⑴ 中文的句号是空心圈（。），英文的句号是实心点（.）。
My Opinion of Online Teaching and Learning In recent years, the technology of online teaching has brought an army of convenience and benefits on students and instructors. Although it's not a main current of us to get knowledge, it developed quickly and really helped a lot.However, this year is the most different and difficult year for education in last decades. Because of the novel corona virus, we have to accomplish tasks at home by online studying. It is a controversial topic to students which have brought us some problems. Now I will talk about my opinion of online teaching and learning. In my point of view, online teaching is not so efficient and helpful as offline teaching. It is known to us all that each coin has two sides, online teaching is no exception. Nevertheless, I think it has more disadvantages than advantages.Here are some of my arguments. From the aspect of students, your attitude and capacity of self controlling can be the most important element to determine the result of the study and determine your grades. For the students who can't control themselves well, undoubtedly it is a terrible disaster of their study careers. Virtually, there are too many things to disturb us at home. Lack of the interaction between students and teacher, online teaching can be boring and hard to understand easily for some students. The most important thing is that without the studying atmosphere, it is hard to concentrate on studying for a long time. Therefore, some students will miss some important knowledge points. If students are getting bored with the studying, no matter what kinds of information can distract them from online studying. Otherwise, if the knowledge is too hard to understand, some students will be nervous and desire to escape from the difficult tasks instinctively. If they escape from the class, it will be more difficult to understand the next knowledge points. Gradually, those students will lose the passion of learning completely. For the students who can manage their time easily, it is a great method for them to study by themselves because it can be convenient to learn a variety of knowledge. Compared with the students who can't control themselves, those students will make progress easily and the gap between them will be bigger and bigger. From the aspect of teachers, online teaching can be a new challenge for them. Because during online teaching, it will be difficult to know the situation of how well do students master the knowledge. Additionally, older teachers will be difficult to use the online equipment fluently. There are also quite a few problems to disturb the teachers such as their naughty children will make trouble and so on. In conclusion, online teaching and learning are definitely a good way to study in the course of the epidemic situation. But it can never take the place of offline teaching absolutely.
英语写作中逗号的使用规范 逗号的作用 逗号用来表示一个句子中的简短停暂。逗号的使用不能大意，因为一个错位的逗号可以改变整句话的原意。例如： James hit Lane, and Edward, then ran away. 詹姆斯打了莱恩和爱德华，然后跑掉了。 James hit Lane, and Edward then ran away.詹姆斯打了莱恩，然后爱德华跑掉了。 同时，当有必要澄清一个意思的时候，应该用逗号。如果随意省略逗号的使用，往往会导致歧义或者误解，例如： This lawyer, said the judge, is a fool. This lawyer said the judge is a fool. 逗号使用的场合 1. 用逗号来分开两项以上物品。在一个清单（list）中，如有超过两项以上物品，要用逗号将其分开。例如：?cars, trucks, vans, and tractors?. 在van之前加上一个逗号来区别tractor 和其他车辆不是同一类的。 2. 用逗号来分开两个平行主句。例如：?cars should park here, and trucks shoul d continue straight on?. 3. 在从句的首尾部加上逗号。例如：?Legaltranz, which is a legal English website, shares translation knowledge?. 4. 在某些引导从句后加上逗号。例如，?Having visited https://www.doczj.com/doc/e91630285.html,, I found it very useful?. 5. 为了避免误解，在主句中，用逗号将从句或短语分开。例如：?I did not go to work yesterd ay, because I was unwell?. 6. 在直接引语后面加逗号。例如, …He said, “my lawyer is a genius!”?. 7. 在形容词之间加上逗号（如果每个形容词用相类似属性修饰其管辖的名词）。例如：?a small, dark room?. 不过，但形容词用不同属性修饰其管辖的名词时，就不需要使用逗号。例如：?a distinguished international lawyer? 或…a shiny blue suit?.内容来源于英果网。
英语中标点符号的用法大全 1、逗号(comma) , 英文中逗号的作用和汉语是一样的。另外，逗号还使用于用who和which的定于从句。 英文中的分号和逗号是同一符号。分号隔开并列关系的单词和短语。需要注意的是，使用了分号的短语一般最后一项内容前都是用了and或者or，此时和汉语所不同的是and或or前也应该使用分号（这是最最最常犯的语法错误之一，很多英语使用者都不知道），否则有可能造成歧义。比如，猫、狗和牛应该是"cat, dog, and ox"而非"cat, dog and ox"。 2、句号(period) . 英文中的句号的作用和汉语一样。 英文中的简写符号和句号是同一符号，比如Mr.、 Ms.、etc.等等。如果句号作为简写符号使用，那么这个词语简写前后面的符号应该照常写上，因为简写号并非句号，也不遵循句号的语法。比如Entreprise Co., Ltd或者I invited Tom, Jerry, etc..（注意两个点）。
3、冒号(colon) : 英文中的冒号的作用和汉语一样。当冒号后是引用一个人说的话，也可以使用逗号。 4、分号(semi-colon) ; 英文中的分号的作用和汉语一样。需要注意的是，分号和逗号有时是可以互相交替的，比如如下的情况。 Tom met me, and later he met Joan. Tom met me; later he met Joan. 或 Tom hates cheese, but he likes butter. Tom hates cheese; he like butter, though. 当只有两个句子相并列时，分号可以和被逗号+连结词互替。但注意第二个例子里，but的转接意是需要用其他成份补充的。 5、引号(quotation mark) 英文中的引号的作用和汉语一样，可用于引用和戏虐。 引号同时可以作为书名号，但只能使用于短诗歌，短故事，短电影和歌曲上。参见下文中“斜体字”。在英国，引用原话应该使用单引号，而话中话应该使用双引号。自然，引用和戏虐应该使用单引号了。 在美国，情况恰恰相反。另外，在美国，如果后引号和一
一、标点符号的运用 1．引号的用法 (1用于引用某说话人或作者的话 1被引用的句子首字母需要大写e.g. Ben Franklin wrote, “To lengthen thy life lessen thy meals.” 2如果引用部分被隔开，后半部分的引用部分首字母不需要大些，除非前一部分的话已经说完整而引用的后半部分又是另一个新句子e.g. “Did you know,” said the nutrition expert, “that it’s healthier to be ten pounds overweight ?” “If I go with you to the dinner party,” my friend said, “you must promise not to discuss politics.” 3引用部分如需和句子其他部分隔开要使用逗号 4引号总位于句子标点符号的外面 (2用于标出短篇作品的名称文章标题、报纸、杂志、书名等一般需要用引号标出，也可以在名称下加下划线。在使用电脑写作时，可以用斜体字来表示这些名称。 e.g. the article “The Problem of Acid Rain” in the magazine Newsweek (3话里有话，或者话里需要引用使用单引号e.g. The physics professor said, “For class on Friday, do the problems at the end of the chapter titled ‘Work and Energy.’” 2．逗号的用法 (1在并列句中，连词(and, but, or, for, so, nor, yet的前面用逗号： He asked the question in a loud voice, but no one answered. Come early, or you’ll miss the show. (2状语从句或短语（介词短语、分词短语）在主语之前或在句子中间时，后面用逗号 e.g. When the bell rang, the teacher dismissed the class. The audience, interested in the topic, asked the speaker many questions. (3在句中起同样作用的一系列词语或短语要用逗号分开。e.g. The street vendor sold watches, necklaces, and earrings. The pitcher adjusted his cap, pawed the ground, and peered over his shoulder. Joe peered into the hot, still-smoking engine. *and前面的都好可以省去，不过一般都会使用逗号。 (4插入语的前后用逗号分开 T he director, in fact, has done very little work. Your work, I’m sorry to say, is not satisfactory. (5非限定性从句或短语和句子的主要部分之间要用逗号隔开 Wang Ling, who is the best singer of the class, will teach us to sing the song. 3. 冒号 (1引进解释e.g. Here’s a temporary solution to a dripping faucet: Tie a string to it, and let the drops slide down the string to the sink. Three causes have been given for the failure: poor planning, insufficient manpower, and the shortage of material. (2引进引语 e.g. My grandpa often mentions one saying b y Confucius:”To day you know when you know, and to say you do not when you do not, that is knowledge.” (3引进一个list e.g. The store
AIDS is the threat of entire society What is AIDS? AIDS is a serious infectious disease that can cause people to death. The AIDS virus which is also call human immunodeficiency virus(HIV) invades the human body then destructs body's immune function. It can make people suffer from various incurable infections and tumors. The full name of AIDS is Acquired Immune Deficiency Syndrome. From its name we can know three specific definition, Acquired means the cause is acquired rather than innate; Immune Deficiency means in the aspects of pathogenesis, it is mainly caused by the body's immune system and lead to reduce the damage or loss of the protective function of the immune system; Syndrome means In the clinical symptoms, complex symptoms due to various system immunodeficiency caused by infection and tumor. The origin of AIDS is Africa and mainly comes from developing country. Transmission and pathogenesis of AIDS The AIDS virus mainly exists in the various body fluids of the AIDS virus infection and has strong infectious. The main route of infection of the AIDS virus are sexual transmission, blood transmission and mother to child transmission. From HIV infection to develop into AIDS patients has four stage: The first phase is acute stage, The second stage is the asymptomatic period, which is called the incubation period, too.The third stage is the pre AIDS.The fourth period is full period of AIDS or AIDS in the late, which is the most complex. The treatment and prevention of AIDS AIDS is a serious infectious disease with high fatality rate, there is still no cure for drugs and methods, but can be prevented. Drug therapy can be divided into three categories: Anti HIV drugs, immunomodulators and anti infective Drugs. AIDS is a threat to every person and every family, the prevention of AIDS is the responsibility of the whole society. Many daily behaviors cannot infect AIDS virus. To comply with sexual morality is the fundamental measures for the prevention of the sexual transmission of AIDS. Sharing syringes, drug taking is a major channel for the spread of AIDS, therefore, we should refuse drugs and cherish life.
外教一对一https://www.doczj.com/doc/e91630285.html, 英文“逗号(comma)”用法 1. 从句什么时候用逗号，什么时候不用逗号? 简单来说，主句是重点信息，从句是补充信息。英语在句子结构上也要突出重点：当主句在句首的时候，从句前不加逗号;当从句在句首，为了突出重点，需要加入逗号突出主句。 I will visit the Tower if I go to Beijing. 重点在句首，if前就不必加逗号。If I go to Beijing, I will visit the Tower. 从句在句首，为了刻意强调重点，主句用逗号隔开。 再比如： A car might crash into his house if he were to build it on Interstate-40. if he were to build it on Interstate-40, A car might crash into his house. 2. 虚拟语气的倒装 如果你稍稍了解虚拟语气的知识，那么你应该明白一条规则：在 if 引导的虚拟语气中，可以省略掉if，将were / should/ had 提前。 所以在美国中学生必读的一本小说《To Kill a Mockingbird》中，有这样一句话： He would probably poured it into his milk glass had I not asked what the sam hill he was doing. 我现在直接告诉你这句话是一句虚拟语气，那么按照我们这条规则，上面的话就是倒装，而原本的句子应该是： He would probably poured it into his milk glass if I had not asked what the sam hill he was doing. 是不是句子一下子就变成了我们喜闻乐见的if从句，一下子就清晰了起来有木有? 而且，根据第一部分的理论，这里的 if 从句前没有必要加逗号。而且即在这句话的倒装形式里，也没有加逗号啊! 再来看题目中的句子， Violet might have won the competition to be Willy Wonka's successor, had she not eaten the inflatable gum and turned into a giant blueberry. 我还是直接告诉你这依然是一个虚拟语气，如果还原一下，把 if 加进去，变成了： Violet might have won the competition to be Willy Wonka's successor, if she had not eaten the inflatable gum and turned into a giant blueberry. 咦，为什么 if 放在后面也有一个逗号呢?
《美国大学英语写作》中标点符号的使用规则 一、标点符号的运用 1．引号的用法 (1)用于引用某说话人或作者的话 1)被引用的句子首字母需要大写 e.g. Ben Franklin wrote, “To lengthen thy life lessen thy meals.” 2)如果引用部分被隔开，后半部分的引用部分首字母不需要大些，除非前一部分的话已经说完整而引用的后半部分又是另一个新句子 e.g. “Did you know,” said the nutrition expert, “that it?s healthier to be ten pounds overweight ?” “If I go with you to the dinner party,” my friend said, “you must promise not to di scuss politics.” 3)引用部分如需和句子其他部分隔开要使用逗号 4)引号总位于句子标点符号的外面 (2)用于标出短篇作品的名称 文章标题、报纸、杂志、书名等一般需要用引号标出，也可以在名称下加下划线。在使用电脑写作时，可以用斜体字来表示这些名称。 e.g. the article “The Problem of Acid Rain” in the magazine Newsweek (3)话里有话，或者话里需要引用使用单引号 e.g. The physics professor said, “For class on Friday, do the problems at the end o f the chapter titled …Work and Energy.?” 2．逗号的用法 (1)在并列句中，连词(and, but, or, for, so, nor, yet)的前面用逗号： He asked the question in a loud voice, but no one answered.
COMMA （逗号） 1. In a Series –Place a comma between three or more items connected by a coordinating conjunction (在一系列——三个或三个以上项目之间放置一个逗号由并列连接词连接) Caution: Do not place commas between two items separated by and or between three items separated from one another by ands. (警告:两个项目之间不加逗号隔开或由and三个项目之间彼此分开) Incorrect(错误的)： Correct: Remember to place a comma before the coordinating conjunction joining the last two elements of the series. Otherwise, the intended meaning of the sentence may not be clear. （记得把逗号并列连接词前加入的最后两个元素系列。否则,句子的含义可能不清楚。）Confusing：
Confusing： 2. Between Coordinate Adjectives –Place commas between equal adjectives with no coordinating conjunction between them. （之间协调的形容词——与不平等的形容词之间加逗号协调它们之间的结合。） Example: