陈述句语序一I do not know when he will come back.二I do not know when will he come back.哪个对?

陈述句语序一I do not know when he will come back.二I do not know when will he come back.哪个对? 例如do you know 后面是陈述句语序 那么什么样的语序是陈述句语序呢? I do not know I do not know 英语从句语序I do not know when will i be free 这是宾语从句吧 从句不是用陈述语序么?应该是 I do not know when i will be free Do you know which is the way to the park中的宾语从句是不是陈述句语序 I don't know what is he doing这句为何是疑问句语序而不是陈述句语序 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 know ,I,not,that,do怎么连成一句? 请问 I DO NOT KNOW sorry,i do not know! Why I do not know When is the meeting?I do not know.（连成一句） I do not know ____ ____ ____ ____ . When shall we meet?I do not know(合为一句) I do not know ___ ___ meet I do not know how to do do you know which is the way to the museum为什么不用陈述句语序我认为既然这是宾语从句应该用陈述句语序即 do you know which the way to the museum is？为什么不对， Do you know who____(be) the first man to walk on the moon?为什么不是陈述句语序? Do you know what is the matter with her?那个what is the matter,不用陈述句语序吗?为什么啊