Tom did homework last night. 改为否定句

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Tom did homework last night. 改为否定句
Tom did homework last night. 改为否定句

Tom did homework last night. 改为否定句
Tom didn't do homework last night.
注:原句中的DID是实义动词‘ 做’ ,一般过去时,变否定句时要加助动词DIDN‘T ,助动词后的动词要用原形,故DID 改为do
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