句子成分剖析：What good would it do to tell them that?

What good would it do to tell them that?

请问老师此处，what good作什么成分?

句意：把那（件事）告诉他们有哪些好处呢? 这里what是形容词使用方法，构成疑问句且作定语修饰名词good“利益；好处”，what good作动词do的宾语。又如：

What good does it do then! 那样如此做有什么好处？

What time will you come? 你什么时间来？

What book is that? 那是什么书?

What college are you attending? 你在念什么大学?

What experience has she had? 她有哪些体验?

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