高中英语必修五第五单元B5U5.ppt

5) 主语从句中有动词do, 后面作表语的不定式 的to可带可不带。 What we can do now is (to) wait. 6) find 当“发现”讲时，后面作宾语补足语的 不定式符号to可带可不带。 We found him (to) work very hard at the experiment. 但如果是不定式 to be, 则不能省略。 She found him to be dishonest. (3) Should there be a flood, what should we do? , they would certainly come and help us. (2) Were I you , I would do the work better. Had they time If I had time (If I were you) (If there should be a flood) 4. 连词if在部分虚拟条件句中可省略, 但要将 后面的should, were, had提到主语的前面。 5. 英语中有一些固定的省略结构： 在以if, when, though, as if (好象)等连词引导 的从句中, 如从句中的主要动词是be, 常将主语 it 和动词be 省略。 If necessary, we shall send a telegram home. 如有必要, 我们就往家里打电报。 Whenever possible, he will come to my help. 他一有可能就来帮助我。 it is it is 替代 (一)so和not作替代词, 代替被省略的某个词(组) 或句子, 一般同表示个人看法或想法的动词连用, 作be afraid, believe, become, all, do, expect, fear, hope, imagine, say, see, speak, suppose, think 等的宾语。Not代替否定的句子还可放在 perhaps, probably, absolutely等副词后。 e.g. She was not angry at first, but became so (=angry) after a while. --Is he the best student in the class? --I think so (=He is best student in the class). --I think not (=He is not the best student in the class). (二)替代的应用 1. so可以放在句首或句尾, 但若谓语动词是see, notice, hear等,则只能放在句首。如： I believe (say, think…)so. =So I believe (say, think…). —He is absent today. —So I see (hear, notice). 2. 在表示肯定或怀疑意义的句中不可用so。 如：误: I doubt so. 正: I doubt it. 4. do so一般只用替代动态动词, 不替代静态 动词。如: She said she would go with me, but she didn’t do so. ---Alice feels better today. ---I think she does. ---So she does. 而不能说 I think she does so. 3.在ask和know之后也不用so。如： 误: Why do you ask so? 正: Why do you ask that? Notes 1. 省略句可同时省掉句子几个成份 What exciting news! (= What exciting news it is!) 多么令人激动的消息啊！ Pity he’s failed. (= It is a pity that he’s failed.) 很遗憾, 他失败了。 I like him more than her. (= I like him more than I like her.) 我喜欢他更甚于喜欢她。 3. 被省略的部分一般可以在句子中补上, 但 有时省略结构已经定型, 如果把省略部分补上, 反而不合乎习惯。 H