为什么是一个疑问副词。

Why is an interrogative adverb.

疑问副词用于提出问题。

Interrogative adverb is used to ask questions.

你知道哪些常见的疑问副词？

Do you know any common interrogative adverb?

疑问副词通常出现在句子的开头。

Interrogative adverb usually appears at the beginning of a sentence.

学习疑问副词可以帮助你更好地提问。

Learning interrogative adverb can help you ask better questions.

疑问副词where后跟不定式, 构成不定式短语.

While she was wondering where to go , she met a policeman.