以Do you know开始的句型为何后边有陈述与疑问两种,如何区分?

Do you know作为开头后边用陈述还是疑问关键看后面的句子问的东西在后面的句子占有什么成分,如果在后面的句子占有的是宾语,那么用陈述句,比如原本一个Where is he?
在Do you know后就是Do you know where he is?
因为所问的Where在句子Where is he?中做宾语.(不是主语)
像what's the matter? what has happeded?what's wrong?因为所问的成分在疑问句中所占的成分是主语,不用变换位置了,所以用Do you know what's the matter? 还有Do you know what's happened?Do you know what's wrong?
你的句子不对,因为which coat 在后边的句子占有的是宾语,所以要用陈述句,Do you know which coat he would like to try on.

一般都是接陈述语气的。
上面所说 " Do you know what's the matter? " 只是特殊情况。
只要记住哪些特殊的就行
问英语老师吧

要后用面的句子是不是疑问词作主语,如果的话,就是要用疑问语序,如是疑部词不是作主语的话,就要陈述语气.
例如:Do you know what has happeded?什么发生了,what作主语.
类似的还有what's the matter/what's wrong.
Do you know what his name is ?
his name is what...