为什么主句为I didn’t think ,丛句为he could have done的反意疑问句的疑问要用did he,可以从语法上给我解答吗?

为什么主句为I didn’t think ,丛句为he could have done的反意疑问句的疑问要用did he,可以从语法上给我解答吗? I don't think these are made of real silk,are they?为什么是这的?不是do 为什么为什么I don't think 不是主句? I didn't think he was happy,was he?这句话对吗我觉得应该是I didn't think he was happy,did 当主句部分谓语动词为think,believe,guess,疑问句应和从句的人称时态保持一致（主句时态必需是一般现在时）；但如 He didn't think he could pass the exam.反意疑问句是did he?还是didn't he?为什么?我看别人的答案都是did he?这个句子不是否定转移了吗,为什么这个反意疑问句要按主句的否定形式写?I don't think he will pass t but i don't think you can smoke here.I didn't know this is a...为什么是didn't Why Didn't I Think of That? Do you think I didn't!翻译 Why didn't I think of that before?这里的助动词为何用didn't,而不用don't. I didn't think they were ugly和Why would I think it's ugly 为什么一个用were一个用 is?I didn't think they were ugly.Why would I think it's ugly? not...until这个句式可以这样用么?为什么?I didn't believe I could do it until I got to the top.主句中的didn't和后面的until,可以隔（...believe I could do it...）来用么? only i hadn't lost my carIf only I ___my carA.hadn’t lost B.wouldn’t lose C.didn’t lose D.haven’t lost选A.为什么呢.虚拟不应该是主句would+动原嘛 i went to the shop ,but it didn't open.主句是哪一句? his teacher didn't think (THAT)he was blight 怎么看从句是做主句的宾语? Didn't you just say what I think you did that you need me didn't think i turn I didn't think that worse的汉语意思是什么 i didn't think humans should k___ animals for meat. i think you need some help改为否定句 i _didn't_ think you need any help 为什么用didn't不用don'ti think you need some help改为否定句 i _didn't_ think you need any help 为什么用didn't不用don't诸位啊 didn't