that从句后的时态与语序Don't you believe that he did see a UFO?为何不能说是Don't you believe that he saw a UFO?

that从句后的时态与语序Don't you believe that he did see a UFO?为何不能说是Don't you believe that he saw a UFO? 宾语从句主句和从句时态语序的变化 But they are always talking about what will happen if I don't succeed.请问一下从句中句子不是要用陈述语序吗,这里的what 后为什么用的是疑问语序, 表语从句的引导词、语序、时态分别要求什么? i don't know who will come这是个宾语从句对吧,从句的时态不应该与主句相同吗,为什么还用will Reason后的定语从句that 与why 如何区别呢?1)I don’t know the reason why he said these words.2) I don’t know the reason that he said these words.这两句that 与why 都引导定语从句,如何区别何种情况用why ,that呢? but I don't know where it is.这句话正常的语序是什么,是不是宾语从句 when与while后的从句应用什么时态 I don't know which is the best answer 和I don't know which the best answer is 那个从句的语序正确 I don't know what is the time为什么这里的宾语从句不用陈述语序?按理来说应该是I don't know what the time is 开头用Don’t的句子后面用什么时态如果在句中呢 don't 后动词用什么时态 i don't know if 后跟什么从句时态是怎样的 初三英语宾语从句问题,1.我想问特殊疑问句做宾语从句时,从句的语序是什么,我的英语老师说是主+谓 例：I want to know what you were doing at that time.可是我在练习上又看到了另一种：I don't know how t 书本的一句话 But I don't know who will come. 不是说从句用陈述句语序吗?不是应该为 But I don' know who come will I don't know 后面跟的宾语从句是用现在还是用过去时态?比如 I don't know what you said /say.那个准确宾语从句 主句和从句的时态 可以 前后不一致吗？ I don't know what‘s wrong做宾语从句时,语序是否不变? 什么时候宾语从句用陈述句语序什么时候不用 I don't know what's your hobbies 英语语法大师进,要I realized that it doesn't matter if you don't understand every word.这句话的分析详解,包括为什么从句不和主句时态一致以及主从结构