i think he must have been a mechanic,中的must和have been是什么词啊?

i think he must have been a mechanic,中的must和have been是什么词啊? I think he is must abolish. didn’t see him in the library this morning,so I think he must have gone to Paris y...didn’t see him in the library this morning,so I think he must have gone to Paris yesterday,____?A.must he?B.don’t C.didn’t he?D.must 请逐项说明!并分 I think he must be a teacher,_____ _____. I think he must be mad.有语法错误吗? YOU must have missed some word,I think. I think he must be at home now变反意疑问句I think he must be at home now,__? Let him____a rest.I think he must be tired after a long walk(请说明原因）A.have B.gets C.to have D.has Let him___a rest.I think he must be tired after the long walk.A have B gets C to take D has 该选那一个呀“Not having returned home yet,_________”,his father said to the police.A.his mother got worried B.his mother must be worriedC.I think he is missing D.he must have got into some trouble. joking.must.he.have.I.was.thought 连词成句 I can't find my wallet .I think I must have d____ it somewhere He isn't in the school .I think he __be ill.A.can B.must为什么? He isn't at school .I think he ( )be ill.can,shall,must,has to ,原因. Over a hundred people must have been driven away.( )they were.填I think .还是 I am sure请帮忙翻译：1.抚养费2.Whatever make you think of such a thing.3.He should be instructed in his duties. 我写的英语句子,请帮我看下对错he may has lunch at your home.he may be ill,so he can't go there.He may have been in the Egypt.I' m not sure if he ill.He can't have been jumping at that moment.I think that you must have been the fastet of I think I'm very lucky,and he must be crazy! i like we must m____ plans for it i think you have the w____ number