time用法知多少

一. 句型

1. It’s time for sth . 或It’s time ( for sb . ) to do sth . 意为：该是……的时候了。例如：

It’s time for dinner . 该是吃晚餐的时候了。

It’s time for children to go to bed . 是小孩睡觉的时候了。

2. It’s ( high ) time ( that ) sb . did sth .

意为：该是……的时候了。该句型中的that 从句需要用虚拟语气，谓语动词常用过去式。例如：It’s high time that we stated . 我们该出发了。

It’s time that we devoted ourselves to our country . 该是我们报效祖国的时候啦。

3. This is the time when sb . should do sth . 或The time has come when sb . should do sth . 这两个句型也用来表示“该是……的时候了”，when 引导的定语从句用陈述语气或“sho uld + 动词原形”的形式。例如：This is the time when you should get u p .是你该起床的时候了。

The time has come when we must part from each other .该是我们必须道别的时候了。

提示：以上几个句型都可以表示“该是……的时候了”，形式虽然不同，却可以互相换用。如“该上学了”，可用下面几种句型来表达：

It’s time for school . It’s time for us to go to sch ool .

It’s ( high ) time that we went to school .

This is the time when we should go to school .

The time has come when we should go to school .

4. every ( each , any , next , first , last ) time 作连词使用，引导时间状语从句。例如：

Every ( Each ) time I saw him , I found him to be taller . 我每次遇见他，都觉得他又长高了。

The last ( first ) time I went to China , I visited Shanghai .

我上(第一)次到中国时，游览了上海。

5. by the time 引导时间状语从句时，意为：到……时为止，主句一定要用完成时态。例如：

By the time he was twelve , Edison had built a chemistry lab for himself 。

爱迪生十二岁时，就建立了自己的化学实验室。

6. This is the first ( second , last ) time ( that ) sb . has done sth . 意为：是某人第几次……。在该句型中，this 可以由that 或it 替换;从句中的谓语动词必须用完成式，且要与主句谓语动词be 的时态保持一致。例如：

This is the third time I have been to Beijing . 这是我第三次去北京了。

That wasn’t the first time Linda had taken too many pills .

那不是琳达第一次服用这么多的药丸了。

It will be the fifth time that he will have been invited to such a meeting .

这将是他第五次应邀参加这种会议。

7. 三倍以上倍数的表达方式常用以下几种句型：

(1)A is times + as + 形容词或副词的原级+ as + B

(2)A is times + 形容词或副词的比较级+ than + B .

(3)A is times + the + 名词+ of + B .

例如：The sitting room is 3 times as large as the kitchen . 起居室的面积是厨房的三倍。

Your bag is three times larger than mine . 你的包比我的大三倍。

Your cake is twice the size of mine . 你的蛋糕比我的大一倍。

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提示：以上三个句型可互相换用，但有两点需注意：在使用句型(2)时，要注意“倍数”的表达法，使用句型(3)时应首先掌握length , width , depth , height , weight , size 等几个由形容词变化过来的名词形式。例如：

The boy is three times as heavy as his little brother .

The boy is twice heav ie r than his little brother .

The boy is three times the weight of his little brother .

二. 词组

1. in no time 立刻;马上

at no time 决不;在什么时候也不(当at no time位于句首时，该句须用倒装语序)例如：

They arrived in no time . 他们立刻赶到了。