A1 used to ask for information about people or things什么
used in questions that show you are surprised or do not believe something(用于疑问句中,表示惊奇或不相信)
B2 used to ask about the reason for something(用于询问事情的原因)
More examples
What's the matter with you?
What did you think of the film?
What's on at the cinema this week?
What did you say to him?
What kind of dog is that?
B1 the thing(s) that; that which(作关系代词引导从句)…那样的;…的
used to introduce something you are going to say(用于引出要说的话)
More examples
His story of what happened that night didn't correspond with the witness's version.
Please describe to the court exactly what you saw.
If you'd told me what was wrong I could have helped.
They need clear instructions on what to do next.
It's unclear what actually happened that night.
B1 used to introduce your opinion(用于引出自己的观点)
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