并且请你告诉我根据什么知识点来做的.Some students did their homework late last night.（改为否定句）Were they free last week?（改为近义句）
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Some students did not do their homework late last night.
改为否定句就是把句子的动词改为否定形式,这句话的动词是did,它的否定形式是did not,然后再加一个do原形.
Were they not busy last week?
这句话把free改成not busy,是一样的意思,都表示空闲,不忙