1.2. +3.1 that. That they were in truth sisters was clear from the facial resembla nee betwee n them.2 whether.Whether he ll come here isn t clear.3 who whom whose what which whoever whatever whicheverwhere whe n how why.What she did is not yet known.How this happe ned is not clear to anyone.Whoever comes is welcome.Wherever you are is my home my only home.1. it itA. lt+be+ obvious true n atural surpris ing good won derful funny possible likely certa in probable etc. +thatIt is certa in that she will do well in her exam.It is probable that he told her everyth ing.B. lt+be+ no won der an honor a good thing a pity no surprise etc. +thatIt s a pity that we can t go.It s no surprise that our team should have won the game.C. lt+be+ said reported thought expected decided announced arranged etc. +thatIt is said that Mr.Gree n has arrived in Beiji ng.It is reported that China has sent another man-made earth satellite into orbit.D. It+seem happe n +thatIt seems that Alice is not coming to the party at all.AliceIt happe ned that I was out that day.E. It+does n t matter makes no differe nee etc. +It does n t matter whether she will come or not.It makes no differe nee where we shall have the meeti ng.F. that itIs it true that the scie ntist will give us a lecture n ext weekDoes it matter much that they will not come tomorrowG. itHow stra nge it is that the childre n are so quiet2. whoever whatever whicheverWhoever comes will be welcome. whoever=the pers on whoWhatever he did was right. whatever=the thing thatWhichever of you comes in will receive a prize. （whichever=anyone of you who ）你们当中不论哪个进来将会得到奖2）表语从句1•定义：用作表语的从句叫做表语从句。
2•构成：关联词+简单句3. 引导表语从句的关联词的种类：（1）从属连词that.如：The trouble is that I have lost his address.麻烦是我把他的地址丢了。
（2）从属连词whether，as，as if.如：He looked just as he had looked ten years before.他看起来还与十年前一样。
The question is whether they will be able to help us.问题是他们是否能帮我们。
注：从属连词if 一般不用来引导表语从句，但as if却可引导表语从句，如：All this was over twenty years ago ，but it' s as if it was only yesterday.这都是20多年前的事了，但宛如昨天一样。
能跟表语从句的谓语动词一般为系动词be, seem, look等。
如：It looked as if it was going to rain. 看起来天要下雨了。
（3）连接代词who，whom，whose，what，which，whoever，whatever，whichever连接畐U词where，when，how，why.女口：The problem is who we can get to replace her.问题是我们能找到谁去替换她呢。
The question is how he did it.问题是他是如何做此事的。
That was what she did this morning on reaching the attic.那就是她今晨上了阁楼干的。
解释：1. 连词because可引导表语从句。
如：I think it is because you are doing too much.我想这是因为你做得太多。
2. 在一些表示“建议、劝说、命令”的名词后面的表语从句中，谓语动词用虚拟语气。
should+动词原形表示，should可省略。
如：My suggestion is that we （should）start early tomorrow.我的建议是我们明天一早就出发。
3）宾语从句1. 定义：用作宾语的从句叫宾语从句。
2. 构成：关联词+简单句。
3. 引导宾语从句的关联词有三类：（1）从属连词that.如：He told us that he felt ill.他对我们说他感到不舒服。
I know he has returned.我知道他已经回来了。
注：that在引导宾语从句时也并不是任何情况下都可以省略。
在以下情况下，that不能省略。
〔.Everybody could see what happened and that Tom was frightened. （and连接两个宾语从句，that宾语从句放在and的后面时，that不能省略。
）大家都会看出所发生的事情并知道Tom非常害怕。
2.I know nothing about him except that he is from the south. （that 引导的宾语从句作介词宾语时，that 英语不能省略。
）对他我一无所知，只知道他是南方人。
3. That he ever said such a thing I simply don ' t believe. （that 从句位于句首时，that 不可省略。
）我简直不相信他曾说过这样的话。
4. We decided，in view of his special circumstances，that we would admit him for a probationary period. （主句谓语动词与that从句之间有插入语，that不可省略。
）鉴于他的特殊情况，我们决定应允他一段试用期。
英语if/whether.I doubt whether he will succeed. I don t know if you can help me. 3who whom whose what which whoever whatever whichever where whe n how why.Who or what he was Martin n ever lear ned. I wonder what he s writing to me about. I II tell you why I asked you to come. You may do what you will. 1He was deeply displeased by what had occurred that day. I walked over to where she sat. I am curious as to what he will say.Your success will largely depe nd upon what you do and how you do it.I don t care for who marries him. Be careful as to how you do that. 1.itWe thought it stra nge that Xiao Wang did not come yesterday. He has made it clear that he will not give in.happy afraid surprised satisfiedthatI am not sure what I ought to do.I m afraid you don t un dersta nd what I said. I m surprised that I did n t see all that before.Mother was very pleased her daughter had passed the exams.4. 连词 whether （…or not ）或if 引导的宾语从句2.thatthatitexcept but inHe is a good stude nt except that he is careless. You may rely on it that I shall help you.whichwhatAre you sorry for what you ve done3.sure glad certa inpleasedif和whether引导的宾语从句可以互换使用，但whether常和or not连用，if 一般不与or not连用。