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1.It’s time that sb did sth
这个句型意为“该是某人做某事的时候了”。that从句后的谓语动词多用一般过去时,也可以用“should+动词原形”(should不可省略),表示对现在或将来事实的假设,是一种虚拟情况,that可以省略。 time前还可用about,high或really修饰。如:
All right, Jennifer, it’s high time you went to bed.好了,詹妮弗,你该去睡觉了。
I think it’s really time that we should end our discussion.我想我们该结束这次讨论了。
2.It be+时间段+before从句
这个句型有两种含义:(1)主句用肯定式时,句意为“过了……之后才……”;(2)主句用否定式时,句意为“不久就……”。
在这个句型里,时间段还可用long, some time等表示。若主句用一般过去时,则从句也用一般过去时;若主句用一般将来时,则从句用一般现在时表示将来。如:
—Did your manager phone you again the next day? 你们经理第二天又给你打电话了吗?
—No, it was a fortnight before he gave me a second call.没有,过了两周他才再次打电话。
Experts say it may be ten years before this medicine is put to use.专家们说可能要过10年这种药才会投入使用。
It will not be long before we know the result of the experiment.要不了多久我们就可以知道实验结果。
3.It be+时间段+since从句或短语
这个句型也有两种含义:(1)since从句后的谓语动词用终止性动词,如join, come, go, leave, die等时,句意为“自从……已多长时间了”。主句中的时间段始于since 从句的动作。(2)since从句后的谓语动词用延续性动词,如work, smoke, be, live, study等时,句意为“没有……已……”。主句中的时间段是since从句的状态或动作结束的时间段。
在这个句型里,若主句用一般过去时,从句谓语动词也多用一般过去时,有时也可用过去完成时;若主句用一般现在时或现在完成时,则从句用一般过去时。如:
It is two months since he joined the army.自从他参军以来,已有两个月了。
—Haven’t seen you for ages! Do you still study in Beijing? 好久没见到你了,你还在北京学习吗?
—No.I don’t.It’s been three months since I studied there.不在了,我已有3个月不在北京学习了。
It was ten years since he (had) left.他已离开10年了。
It was two years since he was a teacher.他没当老师已有两年了。
4.It was not until ... that ...
这个句型表示“直到……才……”,是一个强调句型。如:
It was not until she took off her dark glasses that I realized she was a famous film star.直到她摘下墨镜,我才认出她是位著名电影明星。
It was not until l936 that basketball became a regular part of the Olympic Games.直到1936年,篮球才成为奥运会的固定项目。
5.It was+时间点+when ...
该句型表示“当……的时候是几点了”,when在这一结构中引导时间状语从句。如:
It was eleven o’clock when she dropped in.她来访时是11点钟。
这个句型意为“该是某人做某事的时候了”。that从句后的谓语动词多用一般过去时,也可以用“should+动词原形”(should不可省略),表示对现在或将来事实的假设,是一种虚拟情况,that可以省略。 time前还可用about,high或really修饰。如:
All right, Jennifer, it’s high time you went to bed.好了,詹妮弗,你该去睡觉了。
I think it’s really time that we should end our discussion.我想我们该结束这次讨论了。
2.It be+时间段+before从句
这个句型有两种含义:(1)主句用肯定式时,句意为“过了……之后才……”;(2)主句用否定式时,句意为“不久就……”。
在这个句型里,时间段还可用long, some time等表示。若主句用一般过去时,则从句也用一般过去时;若主句用一般将来时,则从句用一般现在时表示将来。如:
—Did your manager phone you again the next day? 你们经理第二天又给你打电话了吗?
—No, it was a fortnight before he gave me a second call.没有,过了两周他才再次打电话。
Experts say it may be ten years before this medicine is put to use.专家们说可能要过10年这种药才会投入使用。
It will not be long before we know the result of the experiment.要不了多久我们就可以知道实验结果。
3.It be+时间段+since从句或短语
这个句型也有两种含义:(1)since从句后的谓语动词用终止性动词,如join, come, go, leave, die等时,句意为“自从……已多长时间了”。主句中的时间段始于since 从句的动作。(2)since从句后的谓语动词用延续性动词,如work, smoke, be, live, study等时,句意为“没有……已……”。主句中的时间段是since从句的状态或动作结束的时间段。
在这个句型里,若主句用一般过去时,从句谓语动词也多用一般过去时,有时也可用过去完成时;若主句用一般现在时或现在完成时,则从句用一般过去时。如:
It is two months since he joined the army.自从他参军以来,已有两个月了。
—Haven’t seen you for ages! Do you still study in Beijing? 好久没见到你了,你还在北京学习吗?
—No.I don’t.It’s been three months since I studied there.不在了,我已有3个月不在北京学习了。
It was ten years since he (had) left.他已离开10年了。
It was two years since he was a teacher.他没当老师已有两年了。
4.It was not until ... that ...
这个句型表示“直到……才……”,是一个强调句型。如:
It was not until she took off her dark glasses that I realized she was a famous film star.直到她摘下墨镜,我才认出她是位著名电影明星。
It was not until l936 that basketball became a regular part of the Olympic Games.直到1936年,篮球才成为奥运会的固定项目。
5.It was+时间点+when ...
该句型表示“当……的时候是几点了”,when在这一结构中引导时间状语从句。如:
It was eleven o’clock when she dropped in.她来访时是11点钟。