when后面什么时候加do,什么时候加is
疑问句,一般现在时,行为动词谓语,主语不是第三人称单数,就用do
例:When do they get up in the morning?
When do you come?
疑问句,一般现在时,系动词,主语是第三人称单数,就用is
When is the man here?
When is he doing his homework?
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疑问句,一般现在时,行为动词谓语,主语不是第三人称单数,就用do
例:When do they get up in the morning?
When do you come?
疑问句,一般现在时,系动词,主语是第三人称单数,就用is
When is the man here?
When is he doing his homework?