someone is knocking at the door.It might be the posyman.为什么用
someone is knocking at the door.It might be the posyman.为什么用
someone is knocking at the door.___must be Tom.为什么用he而不用it?
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 .
Someone is knocking at the door.Who it be?— It be Tom.He is
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
--Listen! Someone is knocking at the door. Who _____it be?
---Listen! Someone is knocking at the door. Who _____it be?
There is someone knocking at the door.为什么用“knocking”,要加“ing”