keep加ing要双写吗?
keep watch at...keep也不一定加ing?
keep the water boiling为什么这里boiling要加ing
keep后面是加do还是加doing,STILL后面是加ING吗?
You'd better not keep the door open中为什么open不用加ing?
we must keep the room clean.clean为什么不加ing
Taking the subway is interesting.take作为动词在开头要加ing,那么为什么Keep
keep的动词ing形式
WHOLD YOU LIKE TO KEEP ON TALKING TOO? 中TALK为什么要加ING?TO不是动词不
什么时候加ing,要双写末位字母加ing
英语翻译用上keep on V.ing
为什么keep后面没跟ing