题目内容
7.They did their homework at school yesterday afternoon.(改为否定句)Theydidn't dotheir homework at school yesterday afternoon.
分析 昨天下午,他们在学校做作业.
昨天下午,他们没有在学校做作业.
解答 答案:didn't do.根据yesterday afternoon可知,本句是一般过去时.根据 did their homework 可知did是实义动词,需要用助动词did来帮助否定;又根据did后面用动词原形,故应填didn't do.
点评 本题考查否定句的变法,做本题时比较容易受did的影响,导致只填didn't.
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