59: 句子的哪一部分是who what when where why 和 how？

Question 59: What part of speech are "who, what, when, where, why and how"?
    
Answer: These are sometimes referred to as interrogative words.

More accurately, when 'who, what, when, where, or why' start a question sentence they are interrogative pronouns/adverbs, which take the place of unknown elements in the sentence.


问题：句子的哪一部分是who what when where why 和 how？

回答：这些词有时是疑问词。更确切地说，当 “who, what, when, where,    why'”这些词引导疑问句时，这些词就是疑问代词/疑问副词，取代句子中不知道的成分。