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初中英语:since的四种用法

初中英语:since的四种用法
初中英语:since的四种用法

初中英语:since的四种用法

1) since +过去一个时间点(如具体的年、月、日期、钟点、1980, last month, half past six)。

I have been here since 1989.

2) since +一段时间+ ago

I have been here since five months ago.

3) since +从句

Great changes have taken place since you left.

Considerable time has elapsed since we have been here.

4) It is +一段时间+ since从句

It is two years since I became a postgraduate student.

Since 用来说明动作起始时间,for用来说明动作延续时间长度。

I have lived here for more than twenty years.

I have lived here since I was born..

My aunt has worked in a clinic since 1949.

Some new oilfields have been opened up since 1976.

I have known Xiao Li since she was a little girl.

My brother has been in the Youth League for two years.

I have not heard from my uncle for a long time.

注意:并非有for 作为时间状语的句子都用现在完成时。

I worked here for more than twenty years.

(我现在已不在这里工作。)

I have worked here for many years.

(现在我仍在这里工作。)

小窍门:当现在完成时+一段时间,这一结构中,我们用下面的公式转化,很容易就能排除非延续动词在完成时中的误使。

1)(对) Tom has studied Russian for three years.

= Tom began to study Russian three years ago, and is still studying it now.

2)(错) Harry has got married for six years.

= Harry began to get married six years ago, and is still getting married now.

显然,第二句不对,它应改为Harry got married six years ago.或Harry has been married for six years.

(完整版)初中英语比较级和最高级

◇下列形容词和副词没有比较级和最高 (即表示“最高程度”或“绝对状态”的形容词和副词没有比较级和最高级) empty, wrong, perfect, unique, extreme, excellent, favourite, true, right, correct, extremely ... 形容词副词比较级最高级使用注意事项 ◇比较应在同类事物之间进行。 误:Your English is better than me. 正:Your English is better than mine. ◇比较级前可以有一个表示程度的状语,最常见的三大修饰词是:a little, much, even。 以下单词也可用来修饰:any, far, still, a lot, yet, rather。 My sister is a little taller than me. Their house is much larger than ours. 另外,名词短语也可修饰比较级,说明程度。 I’m three years older than he. 特别提醒:very, quite, too不可修饰比较级。 ◇避免重复使用比较级。 误:He is more kinder to small animals than I. 正:He is much kinder to small animals than I. 误:He is more cleverer than his brother. 正:He is cleverer than his brother. ◇比较要符合逻辑,在同一范围内比较时,避免将主语含在比较对象中,这时需使用other来排除自身。 误:China is larger that any country in Asia. 正:China is larger than any other country in Asia. 误:John studies harder than any student in his class. 正:John studies harder than any other student in his class. 正:John studies harder than any of the other students in his class. 正:John studies harder than anyone else in his class. ◇比较要遵循前后一致的原则,注意前后呼应。 The population of Shanghai is larger than that of Beijing. It is easier to make a plan than to carry it out. ◇序数词通常只修饰最高级。 Africa is the second largest continent. The Yellow River is the second longest river in China. This is the third most popular song of Michael Jackson. ◇为避免重复,我们通常用that, those, one, ones代替前面出现的名词。that 代替可数名词单数和不可数名词,those代替可数名词复数。one既可指人又可指物,只能 代替可数名词。 The weather in China is different from that in America. The book on the table is more interesting than that(或the one)on the desk. A box made of steel is stronger than one made of wood. 误:In winter, the weather of Beijing is colder than it of Shanghai. 正:In winter, the weather of Beijing is colder than that of Shanghai. ◇“否定词 + 比较级”相当于最高级。

since的用法

一.用作介词,意思是“从……以来,自从”,常与完成时连用。 I haven’t written home since Christmas. 自圣诞节以来,我未曾写信回家。 二.用作副词,意思是“从那时以后(一直到现在)”,“其后(到现在之间)”; ever since从那以后一直(更加强调since的用法)。 Things have not changed very much since. 从那时起,情况并没有太大的改变。 His first book was a great success and he has been famous as a writer ever since. 他的第一本书非常畅销,从那时起他就成了一位名作家。 He got a job with the firm in 1970 and has worked there ever since. 他从1970年开始在那家公司任职,之后就一直在那里工作。 三.用作连词 1. 引导原因状语从句,相当于now that,意思是“因为……,既然……,鉴于……”。 Since the rain has stopped,let’s go for a walk. 既然雨停了,我们出去散散步吧。 Since we are young,we shouldn’t be too afraid of making mistakes. 因为我们还年轻,所以不应该太害怕犯错误。 注意:since表示原因时,语气比because弱,表示的原因是对方已知的,或是句中不很重要的部分,是附带的原因,因此引导的从句不是信息的焦点,不能回答why的提问,也不能用在强调句型中作为被强调的内容。since引导的从句往往放在主句之前。 2. 引导时间状语从句,此用法较复杂。 (1) 若since引导的状语从句的谓语动词是终止性动词(如go,come,leave,start,begin等)的过去时,则从句表示的时间是“从该动作开始的那一时刻起”。这是最常见的一种用法。如: He has studied very hard since he came to our school. 自从来到我们学校,他学习就非常努力。 Great changes have taken place in our school since you left. 自从你离开这里,我们学校发生了很大的变化。 (2) 若since引导的状语从句的谓语动词是持续性动词或表示状态的静态动词(如live,stay,study,learn,smoke,be等)的过去时,则从句表示的时间是“从该动作或状态的完成或结束时算起”。如: I haven’t heard from him since he lived here. 这句话应译为:从他不住这儿起,我一直没有收到他的信。 I haven’t eaten snakes since I was a student at school. was表示状态,因此该句可理解为:I haven’t eaten snakes since I left school. 自从我毕业后就一直没吃过蛇。

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初中英语比较级-最高级-讲解及练习(全)

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(完整版)初中英语形容词比较级最高级以及练习题

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三、代词 大多数代词具有名词和形容词的功能。 英语中的代词,按其意义、特征及在句中的作用分为:人称代词、物主代词、指示代词、反身代词、相互代词、疑问代词、关系代词、连接代词和不定代词九种。 人称代词的用法: 指示代词 指示代词分单数(this / that)和复数(these / those)两种形式,既可作限定词又可做代词。 疑问代词 指人:who,whom,whose 指物:what 既可指人又可指物:which 四、冠词 冠词是位于名词或名词词组之前或之后,在句子里主要是对名词起限定作用的词。冠词是一种虚词。 不定冠词a (an)与数词one 同源,是“一个”的意思。 定冠词的用法 定冠词the与指示代词this,that同源,有“那(这)个”的意思。 (1)特指双方都明白的人或物:Take the medicine.把药吃了。 (2)上文提到过的人或事:He bought a house. I’ve been to the house. (3)指世上独一物二的事物:the sun,the sky,the moon,the earth(敲黑板,这个是经常会在选择题中考到的知识点) (4)单数名词连用表示一类事物,如:the dollar 美元;the fox 狐狸; (5)用在序数词和形容词最高级,及形容词only,very,same等前面: Where do you live?I live on the second floor. 你住在哪?我住在二层。

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