比如说
1 Will he be pleased or not?I really don't know.(简单句)
2 I don't know whether he will be pleased or not (宾语从句)
3 I have no idea whether he will be pleaesd or not.(同位语从句)
4 It is not known whether he will be pleaesd or not.(主语从句)
5 就是不能作定语从句!