请问这一题为什么用might have beenhe said he might repair my watch this afternoon,so it_________if I go in on my way home early this evening.答案写的是might have been repaired 为什么不能是might be repaided呢?另外请问这句话

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请问这一题为什么用mighthavebeenhesaidhemightrepairmywatchthisafternoon,soit_________ifIgoinonmywayhomeearlyth

请问这一题为什么用might have beenhe said he might repair my watch this afternoon,so it_________if I go in on my way home early this evening.答案写的是might have been repaired 为什么不能是might be repaided呢?另外请问这句话
请问这一题为什么用might have been
he said he might repair my watch this afternoon,so it_________if I go in on my way home early this evening.
答案写的是might have been repaired 为什么不能是might be repaided呢?
另外请问这句话的翻译,谢谢!

请问这一题为什么用might have beenhe said he might repair my watch this afternoon,so it_________if I go in on my way home early this evening.答案写的是might have been repaired 为什么不能是might be repaided呢?另外请问这句话
这个要弄明白情态动词后面接do 与have done的区别了,情态动词和动词不定式to后面接do表示现在或者将来要发生的事,而情态动词和to后面接have done表示过去时态或者事情已经发生（因为我们都知道情态动词后面要接动词原形,所以不可能用一般过去式的形式did放在后面的）
所以原句的意思是“如果我今天晚上回家早点的话它很可能已经被修好了”,表示在某一时刻动作已经完成要用have done的形式
再如,He must have finished the task.他一定已经完成任务了（表示动作已经过去）
He must finish the task on time.他一定要按时完成任务（表示一种对现在或将来的要求）

请问这一题为什么用might have beenhe said he might repair my watch this afternoon,so it_________if I go in on my way home early this evening.答案写的是might have been repaired 为什么不能是might be repaided呢?另外请问这句话 I might have I might have been hallucinating.请问诸位,这是什么结构的句子啊 .I would have come earlier,but I ________ that you were waiting for me.A.didn’t know B.hadn’t know C.would have known D.haven’t known这一题为什么选a啊虚拟语气对过去的假设是if had done +would / should / could / might have don Tom,you are so lazy!This work------hours ago.A.should finish B.must have finishedC.should have been finished D.might have finished这题为什么选c而不选B了? He_you more help even though he was very busy.A,might have givenB.might giveC.may have givenD.may give想问问这道题为什么选A不选C,我这样想的:句中用了一般过去式,might是may的过去式,其实两项都可以,不过A是更好的 might have 怎么用? 对Perhaps 和表示可能后的答案是He might have gone home early.为什么might后面用原题为Perhaps he went home early 回答为He might have gone home early 问题为在原题中用might表可能时,为什么might后用现在完成时请问这题为什么选这个选项请问这道题为什么选A, 请问这题为什么这样选? 请问这题为什么选B 请问这道题为什么选c 请问这道题为什么选d? 请问这道题为什么这样做请问这题为什么选B? 请问这道题为什么选A 请问这道题为什么选B? 请问这道题为什么选b