一道七年级英语题I saw someone knocking at the door.为什么用knocking,see

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一道七年级英语题
I saw someone knocking at the door.
为什么用knocking,see sb do不是也有吗?
给讲一下,谢谢

see sb do
1.看见某人做了某事
I saw your wallet drop from your pocket.(我看见你的钱包从你的口袋里掉了出来.)一般表示过去时的,已经做过的都用do.
2.表示经常.
I often watch my fish swim around.(我经常看着我的鱼游来游去)
I often hear her sing in the evening.(我经常听见她在晚上唱歌)
总的来说,就是表示常态或已经干完的事,用do
see sb doing
1.偶尔看到/听到的
I hear sb knocking at my door(我听见有人敲我的门)这不是经常听到的事,只是当时正好听到
2.看见某某人正在做,他的动作还未完成.或者我正干什么的时候,看到别人什么正在干什么
I saw him breaking into the shop yesterday.(我昨天看见他的时候他正企图闯入商店)这里强调正在
I saw him running across the street when I walked past the shop.(昨天我路过商店时看见他正横穿马路.)理由同上
总之这中判断要看语境和理解
这里see sb doing主要强调正在敲门

一道七年级英语题I saw someone knocking at the door.为什么用knocking,see i seem to hear someone knocking at the door,knocking为什么要加ing There is someone knocking at the door.为什么用“knocking”,要加“ing” 一道同义句转换题,1.Listen!I hear someone knocking at the door.转换：Li 一道英语填词题There is someone knocking at the door.Please go and s someone is knocking at the door （）i go and see who it is A s —Someone is knocking at the door. —Yes, I’ll go and see who someone is knocking at the door .（）i go and see who it is A I hear someone knocking at the door.的同义句 Listen!I hear someone knocking at the door. --Listen! Someone is knocking at the door. 一道英语选择题,--Someone is knocking at the door.--Yes,it _____be T