句型转换。
【小题1】Some men are singing.(变成单数)
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【小题2】I am riding my bike now. (对划线部分提问)
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【小题3】We are sweeping the floor. (变为否定句)
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【小题4】Tom is sad. (变为否定句)
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【小题5】The boy is crying. (变一般疑问句)
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按要求做题 
1.He is happy（同义句）
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2. I can I help you.（否定句）
___________________?
3. Is she sad？(肯定回答)
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4.She was 10 years old.（一般现在时）
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5. What color is it? (复数句 )
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You can talk in class. (改为否定句)
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I can run very fast （否定句）.
I ________ run very fast.