There is someone knocking at the door.为什么用“knocking”,要加“ing”?

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There is someone knocking at the door.为什么用“knocking”,要加“ing”?
There is someone knocking at the door.为什么用“knocking”,要加“ing”?

There is someone knocking at the door.为什么用“knocking”,要加“ing”?
knocking at the door这是动词ing短语作后置定语,修饰前面的someone,knocking这个动作的执行者是someone,所以用ing形式,表示主动.

有人正在敲门
knocking加“ing”是敲门这个动作正在进行

就是说有人在敲门啊！你听到的时候就是敲门同时发生的时候啊！所以选用现在进行时！

如楼上理解也可以,
但经验之谈是: 但凡 There be 句形,后面的动词用ing形式.
如:There are many boys playing basketball.
There is a boy sitting on the desk.

因为是现在进行式，现在正在发生的事，动词后面需要加ing

There is always someone是什么意思 there are someone还是there is someonert is there someone here与 is someone here 一样么 Is there someone downstair?为什么用someone不用anyone? is downstairs there someone.连词成句 there is someone walking behind you? Is there anyone special?There is someone special.和There is a special one.哪个更好. someone复数单数someone is there.这里是is.someone like water.like是原形.糊涂糊涂. (It is)(There is) someone at the door.(It is)(There is) 选填,急 there is someone in the room 改否定句 there is someone in the classroom.改为否定句急用! Look!There is someone _____(敲）at the door. There is someone downstairs的否定句是什么 there is someone knocing at the door改为否定句 the thief thinks there is someone at home and runs? there is someone live翻译中文s in my heart there is Someone in my heart 什么意思? listen!there is someone ()(sing)in that buildingsing的形式