I don't think he did well in the exam.这里的don't 要改成didn't

I don't think he did well in the exam.这里的don't 要改成didn't I don't think he stole the money,___?A.do I B.don't I C.did he D.didn't he I don't think ken did such a good thing,___?A do I B did I C did he Ddoes he i don't think he put his heart into his study ,______?A.does he B.didn't he C.did he D.doesn't I don't think Ken did such a stupid thing ,____? A.do i B.didi i C.did he D.does he 要解释 i don't think he was i don't think so回答i don't think he was能用i don't think so instead吗 I don't think he did such a bad thing ______(反意疑问句),为什么答案是did he .不应该是didn't I don’t think he could have done such a stupid thing last night,____?A.do I B.could he C.did he D.has he I don t think he could have done so much homework last night,did he?表推测的反意疑问句的问题..1.I don t think he could have done so much homework last night,did he?2.I don t think he could have done so much homework,has he?我知道第一 I don‘t think he is tall,_____?He doesn't think he is tall,_____? I don't ()with peter.I think he is wrong. I don't think he is right.为什么不能是 I think he isn't right. I don't think he is .能否说成I think he isn't . I don't think I don't think 6.I don't think he had his supper at the school,_____?A.had he B.did he C.do I D.don't you7.I don't think he'd like to take such a difficult job,______?A.had he B.would he C.do I D.don't you8.I don't think her passpor's gone,______?A.is it B.has she 是I don't think he looks like还是I don't think he look like?.是I don't think he looks like还是I don't think he look like?是He don't think I looks like还是He doesn't think I look like?请同时将有关于don't think的语法点说一下, I don' t think Ken did such a stupid thing,_____?A. do I B. did I C. did he D. does he 答案是 C ,为什么?求解释.