原句：He washed his clothes yesterday.
一般疑问句的肯定形式：
Did he wash his clothes yesterday?
一般疑问句否定形式：
Didn't he wash his clothes yesterday?
原句是一个肯定句，原句的否定句为：
He didn't wash his clothes yesterday.
另外，由于原句是过去式，所以改写时要注意时态还应该是过去式才行。
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