It turned into a..celebration, I don't know why.
出自： R. Lehmann
Why didn't you stop him?
出自： Day Lewis
Why did you leave Russia?
出自： I. Murdoch
Chance did not understand why she laughed.
出自： J. Kosinski
Why the air of great solemnity?
误 Why did you come to fall into the river?
正 How did you come to fall into the river?
误 Why don't ask the teacher for help?
正 Why not ask the teacher for help?
析 Why not do...?是Why don't you/we do...?的省略形式,无主语时不用助动词do, not后直接加动词原形。
误 Is there any reason that you should have a holiday?
正 Is there any reason why you should have a holiday?
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