There is someone (knocking)at the door为什么是knocking,不是动词原型
There is someone knocking at the door.为什么用“knocking”,要加“ing”
--Listen! Someone is knocking at the door.
there's someone knocking at the door.等于什么
Someone is knocking at the door.同义句改写:There is ___ ___ at th
Someone is knocking at the door.____ is it?
Someone is knocking at the door,but who can____ be?
Someone is knocking at the door._must be Tom
someone is knocking at the door.who [ ]it be?
--Listen! Someone is knocking at the door. Who _____it be?
---Listen! Someone is knocking at the door. Who _____it be?
---someone is knocking at the door.Who _____ it be?
-----Someone is knocking at the door.It ____ be Tom .