英语表达中有些句子虽然含有表示否定意义的词,但整个句子表达的却是肯定的意思.现归纳如下,供同学们学习时参考:



　　一、 在含有 cannot 短语的一些句子中。



　　1. cannot help +doing意为"禁不住......"。如:



　　I cannot help laughing. 我禁不住大笑起来。



　　2. cannot but+do; cannot help but + do; cannot choose + do意为"不得不......"。如:



　　He is such an unselfish man. You cannot help but respect him.他是这样一个毫无私心的人.你不得不尊敬他。



　　I cannot but admire his courage. 我不得不佩服他的勇气。



　　3. cannot...too 意为"越......越好"。如:



　　You cannot be too careful.你越仔细越好。



　　二、nobody/nothing/no one...but...意为"不过是......;只......"。如:



　　Nothing but a miracle can save her now. 现在只有出现奇迹她才能得救。



　　三、在表示双重否定的句子中。如:



　　Without water, nothing could live.没有水,什么也活不了。



　　I cannot go without getting my lessons done.不把功课做好,我就不能去。



　　Don't be so careless with your money.花钱要仔细(不要太随便)。



　　四、在一些句型中。



　　1.在not...until句型中.意为"直到......才".如:



　　He didn't come back until late in the evening. 他直到晚上很晚才回来。



　　She didn't arrive until the game had begun. 直到比赛开始她才到。



　　2. 在 not only...but also句型中 .意为"不但......而且"。如:



　　Not only boys but also girls are invited to the party.不但男孩子们,而且女孩子们也被邀请参加宴会。



　　3. 在 no sooner...than; hardly/scarcely/barely...when句型中.意为"一......就"。如:



　　I had no sooner reached home than it began to rain. 我刚到家天就开始下雨了。



　　She had hardly sat down when she heard someone knocking at the door. 她刚坐下来就听见有人敲门.



　　五、在一些短语中。



　　nothing / not much / little to choose between the two(两者差不多);no more than(仅有); no less than...( 有......之多;正好); not a little(很;非常);not the less (还是;仍旧)等。如:



　　There is not much to choose between the two. 两者不相上下。



　　I'm no more than an ordinary worker.我仅是个普通的工人。
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