名词性从句2

1.主语从句
1.从属连词that，whether，if 引导，

a) that不做成分，但是不能省略。
That she will succeed is certain。
It is certain that she will succeed。
b) whether 引导的主语从句既可以在句首也可以在句末，而if引导的主语从句只能在句子尾部。
Whether he will come is not sure==It is not sure if/wether he will come.

2. 连接代词who，whoever，whom，whose，what，whatever，which，whichever等引导主语从句在从句中做成分，不能省略，而且语序为陈述句。
   What he meant is clear enough。==It is clear enough what he meant（what 作宾语）

   
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