介绍一下主语从句和表语从句?

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What you need is more practice.你需要的是更多的练习.Whoever wants it may have it.谁要都可以给他.同类的连接代词还有：What,who,whom,whose,which,whatever,whoever,whichever 2.以that,whether从属连词引导的主语从句 It was strange that he had made a mistake.真奇怪,他竟然错了.That we need more equipment is quite obvious.我们需要更多的设备,这是很明显的.Whether he will join us won't make too much difference.他是否加入我们,没有太大的差别.3.主语从句的引导词that什么时候可以省略当主语从句不太长时,引导词“that”可以省略 It's clear (that) he has done his best.很明显他已经尽力而为了.It's a wonder (that) he didn't fail.真奇怪,他没有失败.4.以when等连接副词引导的主语从句 When they will come hasn't been made public.他们什么时候来还没有公布.Where she has gone is not known yet.她去了哪儿,还不知道.Why he did it will remain a puzzle for ever.为什么他做那件事将永远是个谜团.5.虚拟语气：主语从句形容词为necessary,important,impossible,strange,natural,essential时,在“It + be + 形容词或过去分词 + 主语从句”中,主语从句要虚拟.It is necessary that the problem (should) be discussed at once.立刻讨论这个问题很有必要.It is strange that he (should) have so many friends.太奇怪了,他有那么多的朋友.6.主语从句与强调句的区别注意事项：1).在主语从句中,把It was … that去掉之后,就已经完全不像一个句子了.2).在强调句中,把It was … that去掉之后,还基本上像个句子.3).主语从句有以下的引导词：what,who,whom,whose,which,whatever,whoever,whichever 4).强调句的引导词只有：that,who.主语从句：It was strange that he had made a mistake.如果把,It was … that 去掉以后,剩下strange he had made a mistake.就不算是句子了.It is immaterial where or when he goes.他去何处或者何时去是无关紧要的.It is said that…,和It is reported that…这样的结构,后面接的是主语从句：It is said that he’s got married.听说他已经结婚了.强调句：It was she that had been wrong.错的是她.（强调主语）如果把,It was … that 去掉以后,剩下she had been wrong.还勉强算的上是一个句子.It was this novel that they talked about last night.他们昨晚谈论的是这部小说.（强调宾语） It was in London that I first saw her.我是在伦敦第一次见到她的.（强调地点状语）