1、第二部分基础语法突破主语从句连接词例句说明连词thatThat he will come and help you is certain.that在引导主语从句时不可省去whether ifWhether there is life on the moon is an interesting question.if只可引导主语从句(不能位于句首)和部分宾语从句主语从句连接代词whowhatwhichwhateverWhat he wants to tell us is not clear.Who will win the match is still unknown.主语从句放在句首，句子常显
2、得笨重，因此一般用it作形式主语，将主语从句放后面连接副词WhenWhereWhyhowIt is known to us how he became a writer.Where the game will be held has not yet been announced.把从句移到句子后面，前面用it来作形式主语连接词例句说明宾语从句陈述意义thatI believe(that)he is honest.We must never think(that)we are good in everything while others are good in nothing.that在句中不
3、担任任何成分。that在口语或非正式文体中常被省去；但如果从句是并列句，第二个分句前的that不可省疑问意义if，whetherI wonder whether he will come or not.Everything depends on whether we have enough money.I dont know if(whether)it is interesting.He doesnt care if it isnt a fine day.whether常与or not连用，此时不能用if代替。作介词宾语要用whether不能用if。从句是否定句时一般用if引导宾语从句特殊疑问
4、意义who，whom，which，whose，what，when，where，why，how，whoever，whatever，whicheverPlease tell me what you want.She always thinks of how she can work well.She will give whoever needs help a warm support.既可作及物动词的宾语也可作介词的宾语注意如果宾语从句后面有宾语补足语，则用it作形式宾语，将从句后置。We must make it clear that anyone who breaks the law wil
5、l be punished.同位语从句连接词例句说明由连词that引导，不担任成分，也可由when，how，where等引导The news that he had landed on the moon spread all over the world.I have no idea when he will come back home.The thought came to him that Mary had probably fallen ill.He must answer the question whether he agrees to it or not.同位语从句解释说明其前面名词的具体内容
