疑问

意义 　　if whether 　　1. I don't know if/whether it is interesting.

　　2. He doesn't care if it isn't a fine day.

　　3. I wonder whether he will come or not.

　　4. Everything depends on whether we have enough money.

　　 　　if和whether一般可以互换, 但当与or not连用和作介词宾语时要用whether, 不能用if; 从句是否定句时一般用if。 　　 特殊疑问意义 who, whom, which, whose,

what, when, where, why, etc. 　　1. Please tell me who will go with you.

　　2. He isn't aware of what a terrible thing he has done.

　　3. I wonder why he hasn't called me.

　　4. She always thinks of how she can work well.

　　5. I wonder where he is going with his classmates.

　　 　　宾语从句作及物动词的宾语, 也可作介词的宾语。宾语从句用陈述语序。

　　 　　 　　注1 　　We must make it clear that anybody who breaks the law will be punished. 　　如果宾语是复合宾语, 则用it作形式宾语, 将从句放后。 　　 　　注2 　　1. We don't think you are right.

　　2. I don't believe he will do so. 　　think, believe, imagine, suppose等的宾语从句, 否定前移到主句中。 表语从句 连词 that whether as if 　　1. The problem is (that)they can't get there early.

　　2. It looks as if it is going to rain.

　　 　　在非正式的文体中that可以省略。 　　 连接

代词 who what which 　　1. That's just what I want.

　　2. The question is who/which of you will be the next speaker.