III. The question is whether the film is well worth seeing.

IV. Whether he will be well tomorrow I'm not sure.

V. Whether it is true remains a problem.

A.引导宾语从句，位于及物动词后

B.引导宾语从句，位于介词后

C.引导宾语从句，放句首

D.引导表语从句，主语从句或同位语从句

whether: A, B, C, D

if: A

2)What\that的区别

I. I think that it is unnecessary for me to speak louder.

II. His mother is satisfied with what he has done.

III. That he was able to come made us happy.

IV. This is what makes us interested.

V. The reason was that Tod had never seen the million-pound note before.

所引导的从句中是否缺主语、表语或宾语 汉语意义 能否省略 What 缺 什么；所......的东西、事情 否 that 不缺 无意义 宾语从句中能省略 3）who\whoever; what\whatever的区别