1.Bob plays with his ball.(改为现在进行时)
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2.We can cross the street now.(改为否定句)
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3.You may go with me.(改为一般疑问句)
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4.He is silly.(改为感叹句)
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5.They are playing. (改为一般疑问句)
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6.That is a truck.(改为否定句)
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7.It’s cold today.(改为一般疑问句)
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