There used to be many green trees in this area in the past .
There used to be many green trees in this area in the past .
There were many green trees in this area in the past.(同义句转换)
There (be) more trees in this area in two years.
This machine was used to cut down trees in the past (改为同义句).
there used to be some trees in this field .完成反意疑问句
There will be many green trees in our city soon的many用什么形式
麻烦大家看这道题There are -----as many houses in this area ther used
There used to be many turtles in the lake.Yes ,but there are
There were many trees here in the past,but there are not now
There's used to be many people smoking in the office,but now
the water pollution in this area used ___(be) terrible 填什么.为
In the past,I used to ...