do you think为什么不能引导宾语从句

where do you think you are为什么是宾语从句 Do you think引导的从句 if引导宾语从句时,可否用于疑问句中?如：Do you think __it__is a good book?还是Do that 引导定语从句时为什么不能作介词宾语 if 引导的宾语从句,可否用于疑问句中?如：Do you think that it is a good book 还是 who do you think you are?是宾语从句吗, Who do you think I can trust?是宾语从句? What do you think of London?（改为宾语从句） What do you think of能接宾语从句吗? Which不能引导宾语从句吗? 主句+引导词+宾语从句 例如 Do you know that there is .Do i think he is clever 这个是宾语从句吗?为什么不用that引导?