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句型34

in case of…(+n.) "以防;万一";

in case that…"以防,万一……"(谓语动词用一般现在时态或should+动词原形)

[例句]

In case of fire, what should we do?

Please remind me about it in case I forget/should forget. 万一我忘了,请提醒我。

In case (that) John comes/should come, please tell him to wait.

Please take your umbrella in case (that it rains/should rain).带上雨伞,以防下雨。

句型35

unless…"除非,如果不……"(=if…not)

[例句]

I shall go tomorrow unless it rains. 如果不下雨,我明天去。

-Shall Tom go and play football?

-Not unless he has finished his homework. 除非他完成作业,否则不能出去。

I won't go unless he comes to invite me himself.

除非他本人来邀请我,不然我是不会去的。

I won't attend his birthday party unless invited (=unless I am invited). 除非被邀请,否则我不

去参加的生日晚会。

句型36

when引导的从句

when除了用来引导主语从句、宾语从句、时间状语从句、表语从句和定语从句,还有一种用法值得关注,那就是when引导并列分句,意思是"这 时突然;就在那时",强调另一个动作的突然发生。常用于以下句型中:(1)、主语 + be doing… when…意思是"正在做某事这时……";(2)、主语 + be about to do…when…;(3)、主语+be on the point of (doing) …when…意思是"正要去做某事这时……"

[例句]

One day Chuck was on a flight across the Pacific Ocean when suddenly his plane crashed. 有一天,Chuck正在太平洋上飞行,这时他的飞机突然爆炸了。

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