I think he must be a fool.这句话有语法错误吗

I think he must be a teacher,_____ _____. I think he must be a fool.这句话有语法错误吗 I personally think he is a fool用must be改写 I think he must be mad.有语法错误吗? i think you must be a teacher是什么意思must be为什么不是must are?must I think he must be at home now变反意疑问句I think he must be at home now,__? i think he must be a teacher,isn't he 这句反义疑问句为什么这样变?i think he must be a teacher,isn't he 这句反义疑问句为什么这样变?为什么不是mustn't he?i think he can be a teacher反义疑问句是不是i think he can be I think he must be in the office now,______?A.don’t I B.mustn’t he C.isn’t he D.can’t hethe reason,please! He isn't at school .I think he ( )be ill.can,shall,must,has to ,原因. 改写下列句子,用MUST BE 来代替括号中的词组① I (personally ,think he is) a fool.② I (personally ,think he is} mad.③ I (personally ,think she is) over forty I think I'm very lucky,and he must be crazy! I don't think he must be sleepy, _______?I don’t think he must be sleepy, _______? A. mustn’t he B. do I C. must he D. is he 为什么答案选择D,不应该是C么,速度.求讲解 i think he must have been a mechanic,中的must和have been是什么词啊? He isn't in the school ,I think he ___ be ill .A.need B.shall C.must D.havt to ,为什么? 英语：I think she must be a teacher,___?怎么写?为什么不用must she呢？ I think he is must abolish. i think he must be right的反义疑问句?顺便说说原因!~~ I think he must be in the office now,______?反意疑问句应该是什么?