名词条款分为主题条款.docVIP

定义 名词性从句分为主语从句、宾语从句、表语从句、同位语从句。所谓名词性从句是用从句替代名词或代词在句中作主语、宾语、表语或同位语。 1. What与 that 在名词性从句中的区别: what 在名词性从句中是代词, 而that 在名词性从句中是连词; what 起主语、宾语、表语的作用，而 that 却不可以。( that 在定语从句中可起主语、宾语、表语作用。) What he said was true. All that he said was true. That Edison invented the bulb is of great value to us all. What Edison invented led us to brightness. 2. Whether / if Whether引导的名词性从句可作主语、宾语、表语或同位语；而 if 只在某些宾语从句中可与 whether互换。 在宾语从句中如遇下列情况只能用whether，而不用 if： ①在discuss,decide等动词后 ②在介词后 ③在不定式前 We discuss whether we should close the shop. We haven’t settled the question of whether I should go to Oxford. She doesn’t know whether to get married to Frank or not. 3. S. + doubt + whether… S. + doesn’t doubt + that. … 说明：doubt = be not sure/certain(of) not doubt = be sure/certain of I doubt whether it’ll clear up. I don’t doubt that he will succeed. I doubt whether it’ll clear up. I don’t doubt that he will succeed. 4. 在wonder肯定式后加 wh-words引导的从句，而在 no wonder后接 that从句，其理由与 doubt相同。 I wonder when we shall get there. There’s no wonder that he has something to do with the robbery. 5. 在as if, as though引导的表语从句中，在必要的情况下应用虚拟语气。 Should常可以省略。 He looks as if he were tired. She speaks English very well as if she came from England.(were a native of England.) I remember the whole thing as if it happened yesterday. We felt as though we had witnessed the whole thing. From time to time Tim turned round as if (he were) searching for someone. The fellow started, as if (he were) awakened from some dream. 6. order, demand, require, request, advise, be anxious that … + (should) do … Please advise me whether I (should) accept the offer. I order that he (should) go at once. They are especially anxious that you should come. He requires that they should work all night. It is requested that a vote (should) be taken. 7. 在order, suggestion等名词后的同位语/表语从句中用虚拟语气, (should)常可以被省略。 Presently he made the suggestion that they carry on the conversation in French. His suggestion was that th