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句型34
in case of…(+n.) "以防;萬(wàn)一";
in case that…"以防,萬(wàn)一……"(謂語(yǔ)動(dòng)詞用一般現(xiàn)在時(shí)態(tài)或should+動(dòng)詞原形)
[例句]
In case of fire, what should we do?
Please remind me about it in case I forget/should forget. 萬(wàn)一我忘了,請(qǐng)?zhí)嵝盐摇?/p>
In case (that) John comes/should come, please tell him to wait.
Please take your umbrella in case (that it rains/should rain).帶上雨傘,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. 除非他完成作業(yè),否則不能出去。
I won't go unless he comes to invite me himself.
除非他本人來(lái)邀請(qǐng)我,不然我是不會(huì)去的。
I won't attend his birthday party unless invited (=unless I am invited). 除非被邀請(qǐng),否則我不
去參加的生日晚會(huì)。
句型36
when引導(dǎo)的從句
when除了用來(lái)引導(dǎo)主語(yǔ)從句、賓語(yǔ)從句、時(shí)間狀語(yǔ)從句、表語(yǔ)從句和定語(yǔ)從句,還有一種用法值得關(guān)注,那就是when引導(dǎo)并列分句,意思是"這 時(shí)突然;就在那時(shí)",強(qiáng)調(diào)另一個(gè)動(dòng)作的突然發(fā)生。常用于以下句型中:(1)、主語(yǔ) + be doing… when…意思是"正在做某事這時(shí)……";(2)、主語(yǔ) + be about to do…when…;(3)、主語(yǔ)+be on the point of (doing) …when…意思是"正要去做某事這時(shí)……"
[例句]
One day Chuck was on a flight across the Pacific Ocean when suddenly his plane crashed. 有一天,Chuck正在太平洋上飛行,這時(shí)他的飛機(jī)突然爆炸了。
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