改复数（1）There is a bridae over the rive.(2) is there a harbor in your city?(3) There was a factory in our town.(4) Was there an orange in the bag?(5) There is an apple in my hand.
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改复数（1）There is a bridae over the rive.(2) is there a harbor in your city?(3) There was a factory in our town.(4) Was there an orange in the bag?(5) There is an apple in my hand.
改复数
（1）There is a bridae over the rive.(2) is there a harbor in your city?(3) There was a factory in our town.(4) Was there an orange in the bag?(5) There is an apple in my hand.
改复数（1）There is a bridae over the rive.(2) is there a harbor in your city?(3) There was a factory in our town.(4) Was there an orange in the bag?(5) There is an apple in my hand.
（1）There is a bridge over the river.
There are some bridges over the rivers.
(2) is there a harbor in your city?
Are there any harbors in your cities?
(3) There was a factory in our town.
There were many factories in our towns.
(4) Was there an orange in the bag?
Were there any oranges in the bags?
(5) There is an apple in my hand.
There are some apples in our hands.
改为复数后就是：（1）There are （many） bridges over the rive. (2) Are there any harbors in your city? (3) There were some factories in our town. (4) Were there any oranges in the bag? (5) There are many apples in my hand.
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