Are you clear?Do you understand?为什么一个用are一个用do,原因何在?

Are you clear?Do you understand?为什么一个用are一个用do,原因何在? Where are you going?What do you want?为什么一个用are 一个用do are you understand 还是do you understand You are bit3h- do you understand Do you understand 和Are you understand 哪种问句是对的?原因是什么? Are you understand正确还是Do you understand正确? 是are youunderstand?还是do you understand? “你明白吗?”用英语是Are you stand?还是Do you understand? where are you from?为什么用are不用do? can you understand?和do you understand?还有are you understand?有 Where did you go?Where are you going 两句话除了时态不同,为什么一个用do 一个用a Where did you go? Where are you going ?两句话除了时态不同,为什么一个用do 一个