名词性从句whether与if.ppt

名词性从句;名词从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。;辨别下列名词性从句的类别： 1.How the book will sell depends on its author. 2.John said that he was leaving for London on Wednesday. 3.The fact is that he has not been seen recently. 4.The fact that he has not been seen recently disturbs everyone in his office. 5.He will talk to us about what he saw in U.S. 6.It is impossible that I go and attend the meeting.;That/wh-clause + v +…主语从句 S +be/link.v + that/wh-clause表语从句 S + vt + that/wh-clause宾语从句 S + vi + prep + wh-clause宾语从句 　 ;that-从句作主语通常用it作先行词，而将that-从句置于句末，例如： It's a pity that you should have to leave. It is not yet decided who will do that job.;whether 与 if 均为 “是否” 的意思。但在下列情况下，whether 不能被 if 所取代： 主语从句;用if 或whether 填空;;（I）试比较下面两个例句: 1.The suggestion that he raised at the meeting is very good. 2.The suggestion that the students should have plenty of exercise is very good.;;用that 或what 填空;选择填空（what,whatever,who,whoever);5、名词从句与定语从句的一些对应关系： 1. He has done what he can to help me. --He has done ____ ____ he can to help me. What I want to say has nothing to do with it. --____ ____ I want to say has nothing to do with it. ;3. Whoever breaks the law is to be punished. ______ ______ breaks the law is to be punished. 4. He will give the dictionary to whoever needs if most. He will give the dictionary to ______ ____ needs it most. 5. We’ll remember whomever we turned to for help. We’ll remember ______ ________ we turned to for help. 6. They will do whatever he wants them to do. They will do ______ ______he wants them to do. 7. I’ll read whichever book you give me. I’ll read ____ of the? books _____? you give me. ; VI 巩固练习 ;3.Dr. Black comes from either Oxford or Cambridge, I can't remember?____. A．where B．there C．which D．that 4.Energy is? ____ makes things work． A．What B．everything C．something? D．anything ;5.Air to us?is ____ water is to fish． A. is that??? ?B. what?????? ?C.