句子“He could catch him, but he doesn't. ”中为什么是does而不是did

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• 英语问题We did not disturb him.(until)He finished work.用括号中的词将两个句子连上We did not disturb him.(until)He finished work.用括号中的词将两个句子连上为什么标准答案是We did not disturb him until he had finished work.而不是We had not disturbed him until he finished work.我老觉得应该这两句话连接在一起后应该是说--在他完成工作之前我们没有打扰他.我老觉得我们没有打扰他应该在他完成工作之前.所以我的思维是这两个句子的结合应该和I had not understand the problem until he explained it.一样.所以我才会将答案写成We had not disturbed him until he finished work.
• 句子“He could catch him, but he doesn't. ”中为什么是does而不是did
• 29.Not only _______ a promise,but also he kept it.A.has he made B.does he make C.he made D.di29.Not only _______ a promise,but also he kept it.A.has he made B.does he make C.he made D.did he make30.Not until his comrades criticized him _____to admit his mistake.A.had he begun B.began he C.did he begin D.does he begin我要问的这个问题一直让我很纠结,比如说29,翻译他不进许下了承诺,而且实现了他,关键是kept是过去时,那么之前肯定也是过去啊或者是过去的过去,为什么不是Did he made呢?30同理选C,为什么是begin呢?而不是began
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