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