大學英語六級名詞性從句語法精要

　　名詞性從句
　　主語從句有三類:
　　由what等代詞引導的主語從句: what表示“…所…的***東西***”, 在結構上等於一個名詞加一個定語從句; whatever表示“所…的一切”; whoever表示“一切…的人”.
　　What you need is more practice
　　What is hard is to do good all one’s life and never do anything bad.
　　Whatever was said here must be kept secret.
　　Whatever I have is at your service.
　　Whoever comes will be welcome.
　　Whoever fails to see this will make a big blunder.
　　由連詞that引起的主語從句: 這類主語從句在大多數情況下都放到句子後部去, 而用代詞it做形式上的主語:
　　That we need more equipment is quite obvious.
　　It is impossible that I may not able to come.
　　It doesn’t seem likely that she will be here.
　　在口語中連詞that有時可以省略掉:
　　It’s good you’re so considerate.
　　It’s a pity you missed such a fine talk.
　　由連線代詞或連線副詞***或whether***引起的主語從句: 這類主語從句, 也可以放到句子後部去, 前面用it做形式上的主語.
　　When we shall have our sports meet is still a question.
　　It is still a question when we shall have our sports meet.
　　Whether he will join us won’t make too much difference.
　　It won’t make too much difference whether he will join us.
　　2賓語從句: 和主語從句及表語從句一樣, 賓語從句也有以上三類.
　　a*** 連線代詞或副詞引導的從句只是在某些動詞後能用作賓語.
　　Tell me what you want.
　　I just can’t imagine how he could have done such a thing.
　　Have you decided whom you are to nominate as your candidate.
　　能跟這類賓語從句的常見動詞有: see, say, tell, ask, answer, know, decide, find out, imagine, suggest, doubt, wonder, show, discover, discuss, understand, inform, advise等. 這種動詞後也常用whether或if引導的從與作賓語:
　　I don’t know whether these figure are accurate.
　　I’m wondering if the letter is overweight.
　　這種從句有時前面可以有另一個賓語:
　　Has she informed you when they are to hold the meeting?
　　Please advise me which book I should read first.
　　有時這種從句也可用作及詞的賓語:
　　Whether that is a good solution depends on how you look at it.
　　He was not conscious of what an important discovery he had made.
　　I was curious as to what he would say next.
　　b*** 用that引導的從句作賓語的情形最為普遍, 在很多動詞如boast, say, think, insist, wish, hope, suppose, see, believe, agree, acknowledge, admit, deny, expect, explain, confess, order, command, suspect, dream, suggest, propose, know, mean, notice, prefer, request, require, report, urge, 以及doubt的否定和疑問式後面都可以用它.