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The use of the wh- words
Who 作主、表；
whom作宾；
whose作定；
what, which作主、宾、表或定;
在从句中
when, where, why, how分别作 时状、地状、
原因状语、方式状语。
由连接代词和连接副词引导的宾语从句，引导词在从句中即做 成分，也有实际意义，所以不能省略。它是由特殊疑问句转化 而来的。
My radio times
When I heard that I had already been a member in the school radio station, I was really surprised and excited .
Last term, our head teacher told us that the school radio station would hold a competition to ask for presenters and directors. Everybody was excited and wanted to have a try. Finally, four girls in our class, including me, were asked to
系表结构作谓语
由that 引导的宾语从句，that在从句中不充当成分，没有 词意，所以常省略。而且它是由陈述句转化而来的。
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2. if/whether 引导 Could I ask if you've mentioned this to her? Tom don't know if / whether his grandpa liked the present. He asked me whether or not I was coming.
