主语从句和表语从句
知识点
1.名词性从句引导词的选择
选择原则“缺什么，补什么，什么不缺，用that”
“什么不缺，用that”的意思是：如果从句中不缺任何成分，而且句意完整时，就用that来引导主语从句或表语从句以及其他的名词性从句。
2.whether 意为“是否”，引导的主语从句放在句首，不能用if 代替；但当用
it 作形式主语时，whether引导的主语从句放在句中或句末，此时可换用if. It is doubtful whether there’ll be any seats left.说不上是否还有座位了。
3.that 引导主语从句时，只起连接作用，不作任何成分，没有实际意义。在句
首时不可省略。What引导主语从句时既要起连接作用，又要在从句中作主语或宾语，在任何情况下都不能省略，它具有具体意义，表示“什么，所……
的（事、物、话）”，相当于all that/ everything that. Which引导主语从句也作成分，它表示选择的意义，常译为“那个”。如：That he survived in the earthquake is a miracle. 他在地震中幸免于难，这是个奇迹。
4.关系代词what, which, who引导主语、表语从句时含有疑问意义，而whatever,
whichever, whoever在引导名词性从句时，往往比what, which, who更强调，不表示疑问意义。而且whatever=all that/everything that; whichever=anything that;
whoever=anyone who.另外，whatever=no matter what时引导状语从句。如：Whatever is worth doing at all is worth doing well.凡是值得做的事情都值得好好地做。
I语法填空。使用正确连接词补全下列句子。
1.They lost their way in the forest and ______made matters worse was ______ night
began to fall.
2.______ drives after drinking should be punished.
3.It is said ______ Peter will have a chance to travel abroad next month.
4.______ we fear when traveling in summer is the sudden change of weather.
5.______ we will go camping tomorrow is up to you.
6.I read about it in some book or other, does it matter ______ it was?
7.______ of you comes in will be given a prize.
8.______ he didn’t come yesterday is unknown.
9.______we will go tomorrow hasn’t been decided yet.
10.______ will be asked to accomplish the task is still discussed.
II. 测试题
1. ---I’ll ask the teacher about the attributive clause. I’m very puzzled about it.
---That’s just ______most of our classmates have doubt.
A.what
B. why
C. where
D. how
2. His father got him a job in a bank but soon it became clear ______ he was not fit for that kind of work.
A. why
B. what
C. whether
D. that
3. It even leaves the scientists in wonder ______ they should call the newly-born creature, which looks half-human and half-animal.
A. that
B. why
C. what
D. how
4. The brave national spirits showed in the film The Flowers of war are ______deeply moved the audience.
A. which
B. that
C. what
D. who
5. ______ is surprising is that there are so many Chinese restaurants in Toronto.
A. It
B. That
C. Such
D. What
6. ---Are you still thinking about yesterday’s party?
---Oh, that’s______.
A.what makes me feel excited
B. whatever I feel excited about
C. how I feel about it
D. when I feel excited
7. Faced with challenges, you should believe your courage is ______ makes a difference.
A. how
B. that
C. which
D. what
8. ______ is obviously right is to give all children equal opportunities to develop their special gift.
A. It
B. As
C. That
D. What
9. The reson for Tom’s failure in the exam was ______ he didn’t work hard.
A. why
B. because
C. whether
D. that
