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【初二英语】【句型】They were mending Englishi at that time.(改为否定句)并说明

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【初二英语】【句型】They were mending Englishi at that time.(改为否定句)并说明理由!
请回答者说明理由!
They were mending English at that time.(改为否定句)
They_____ _____ _____English at that time.
【初二英语】【句型】They were mending Englishi at that time.(改为否定句)并说明
They were mending English at that time.(改为否定句)
They(were)(not) (mending) at that time
句子中已有were(be动词过去式),只要在Be动词后加not便解决了