Danny_____(认为)he could hit the ball,but he hurt his hand.空里应填什么,写出,并说明理由.还有:I often help my mother _____(clean)the room.

问题描述:

Danny_____(认为)he could hit the ball,but he hurt his hand.
空里应填什么,写出,并说明理由.
还有:
I often help my mother _____(clean)the room.

thought
cleaning

thought
用think的过去式,从句意思可以看出是发生在过去的事;从hurt没用hurts也可以知道是过去时.
cleaning
help sb.(in) doing sth.