there used to be a tall tree in front of the house.为什么要加be
问题描述:
there used to be a tall tree in front of the house.为什么要加be
答
there be句型.加上used to表示过去之后,be还是不能省略的.
there used to be a tall tree in front of the house.为什么要加be
there be句型.加上used to表示过去之后,be还是不能省略的.