3. 引导主语、表语、同位语从句时。如：
Whether the football game will be played depends on the weather. （主语从句）
The question is whether he can do it. （表语从句）
The question whether we should go with them must be decided at once. （同位语从句）
4. 在介词之后作介词的宾语时。如：
I haven’t settled the question of whether I’ll go back home.
5. 与不定式连用。如：
Whether to go or stay is still a question.
【实例对接】 Quality input ensures quality output, whether it is speaking or writing. (P6)
【考例答案】 B
