what do you do after school?what are you doing?為什么第一句用do不用are?為什么第二句用are不用do?

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what do you do after school?what are you doing?
為什么第一句用do不用are?為什么第二句用are不用do?

第一句里有两个do,第一个do是助动词,没有实际意义,用于一般现在时,第二个do 是实义动词,是做的意思.正因为句中有实义动词,前面才需要助动词,构成时态.
第二句中的are是构成现在完成时态的助动词.

1.第一句用do是因为这是一般现在时，do是一般现在时的助动词，are是现在进行时的助动词，不能用
第二句用are不用do，理由恰好相反

第一句是含有实义动词的一般现在时的特殊疑问句，也就是特殊疑问词+一般现在时的一般疑问句：
第二句是现在进行时的特殊疑问句，他的结构也是由特殊疑问词+现在进行时的一般疑问句：

第一句do 一般现在时，第二句are是现在进行时

what do you do after What do you do after school? what do you do after school? what do you usually do after what do you do after school? what do you usually do after class? What do you do after shool?（改为同义句） What do you do after shool------ ------? what do you s_____ you will do after school?回答? what do you do after you get up What do you do after breakfast?What do you do before supper? what do you do after school?同义句是what do you do when school（ ） （ what () you often ---------(do)after supper you what after do today will school? what a____do you often do after school? What（）you do after dinner? 填空：What ------ you often ----- (do) after supper? what will you do after class意思 what do you like to after