he must have finished his homework last night,didn't he?为什么是didn't

He must have done nothing but ____ He looks tired,he _______ too little sleep.A must have had B must have C must have been is it he must have fallen or he must have fell?whythank you He must have been ill,___ he?如何变反意疑问句 He can't find his key.He ---------- them.A.must lost B.must have been lost C.must have lost must be和must have been有什么区别he must have been sleeping.为什么这里要用must have been而不用must be he must have read this book yesterday?反问?did not he?have not he?为什么 He must have come have yesterday ,didn'he?这里的have是什么意思?这句是什么时态? He must have been away 哪个是情态动词 是must还是have同上 i think he must have been a mechanic,中的must和have been是什么词啊? He must have finished his homework,_________________(是吗?） he must have gone to Japan,_____he?he must have been to Japan,_____he?he must have gone to Japan last week,_____he?he must have been to Japan last week,_____he? He must have been here yesterday,( 改为反义疑问句为什么 joking.must.he.have.I.was.thought 连词成句 改错 jimmy have a toothache.must he see a denist he must have been mistaken 帮助翻译一下 he must have done it yesteraday,――?he must have done it for 2 years ――?he must have done it yesteraday,――?he must have done it for 2 years ――?he must have been here yesterday――?he must have been here for 2 years――?这几个反 he must have done it yesteraday,――?he must have done it for 2 years ――?he must have done it yesteraday,――?he must have done it for 2 years ――?he must have been here yesterday――?he must have been here for 2 years――?这几个反