改为复数句（题在下面）
问题描述：
改为复数句（题在下面）
1.There is a bridge over the river.
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2.Is there a harbour in your city?
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3.There was a factory in our town.
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答
1、There are bridges over the river.
2、Are there any harbors in your city?
3、There were factories in our town.