句型转换。1. This is a bus. (变复数句)
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2. This is a child. (变复数句)
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3. Here are three cars. (变单数句)
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4. These are many boxes. (变单数句)
____________________________________________________.1. These are buses或These are many buses
2. These are many children或These are children
3. Here is a car
4. This is a box