名詞性從句
　　主語(yǔ)從句有三類:
　　由what等代詞引導(dǎo)的主語(yǔ)從句: what表示“…所…的(東西)”, 在結(jié)構(gòu)上等于一個(gè)名詞加一個(gè)定語(yǔ)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(yǔ)從句: 這類主語(yǔ)從句在大多數(shù)情況下都放到句子后部去, 而用代詞it做形式上的主語(yǔ):
　　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(yǔ)中連詞that有時(shí)可以省略掉:來(lái)源：成就你的夢(mèng)想
　　It’s good you’re so considerate.
　　It’s a pity you missed such a fine talk.
　　由連接代詞或連接副詞(或whether)引起的主語(yǔ)從句: 這類主語(yǔ)從句, 也可以放到句子后部去, 前面用it做形式上的主語(yǔ).
　　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(yǔ)從句: 和主語(yǔ)從句及表語(yǔ)從句一樣, 賓語(yǔ)從句也有以上三類.
　　a) 連接代詞或副詞引導(dǎo)的從句只是在某些動(dòng)詞后能用作賓語(yǔ).
　　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(yǔ)從句的常見(jiàn)動(dòng)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(dòng)詞后也常用whether或if引導(dǎo)的從與作賓語(yǔ):
　　I don’t know whether these figure are accurate.
　　I’m wondering if the letter is overweight.
　　這種從句有時(shí)前面可以有另一個(gè)賓語(yǔ):
　　Has she informed you when they are to hold the meeting?
　　Please advise me which book I should read first.
　　有時(shí)這種從句也可用作及詞的賓語(yǔ):
　　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(dǎo)的從句作賓語(yǔ)的情形最為普遍, 在很多動(dòng)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(wèn)式后面都可以用它.

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