they did homework at school yesterday改否定句

Theydidtheirhomeworkatschoolyesterdayafternoon．（改为否定句）They___theirhomeworkatschoolyes... They did their homework at school yesterday afternoon．（改为否定句）
They___their homework at school yesterday afternoon．展开

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#合辑# 机票是越早买越便宜吗？

乌甲资晓燕
2019-10-10 · TA获得超过1180个赞

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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．

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