Interrogative sentence, it's a question, but it's still a sentence.

疑问句，是疑问句，但还是句子。

Interrogative sentences can all still start with question words such as where, what, when, etc. , and we use an affirmative or negative sentence as the answer.

疑问句仍然以疑问词开头，如 where，what，when 等，我们用肯定或否定句来回答。