如何判断疑问代词是做宾语还是主语（主要是有关宾语从句语序问题）

如何判断疑问代词是做宾语还是主语（主要是有关宾语从句语序问题）
比如Do you know what is the matter而不是Do you know what the matter is.这里是What做主语,但是不知道是怎么判断的.还有是
Do you know whose your bag is 还是Do you know whose is your bag ;
Do you know whose bag is yours还是Do you know whose bag yours is