题目内容

He          his homework          weekends.
A．doesn’t; onB．doesn’t do; on
C．don’t; inD．don’t do; in
B

试题分析：句意：他在周末没有做他的家庭作业。do his homework做家庭作业，do为实意动词，否定形式用does来帮忙，在周末用介词on,固定用法，故选B.
点评：简单地说就是在动词后面加not，有is、am、are的句子会在这些词后面加not，没有is、am、are的句子会在动词前加don't或者do not.如果有must、may、can这类的词，在这类词后面加not. on用于具体的某一天或具体某一天的上午，下午，晚上。
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