1. Do you know the computer? (改为用he作主语的一般疑问句)
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2. This is a computer. (改为复数句)
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3. It is sunny today. (对划线部分提问) 
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4. Can you write an e-mail? (作否定回答)
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1. I played football yesterday.
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2. She wanted to buy a gift for you.
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3. She washed clothes at home.
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4. They cooked noodles together last Sunday.
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5. He missed his grandmother.
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1. _____________ girls are there in your school?  I don't know.
2. _____________ is Kim?  She is at home.
3. _____________ is your mother?  She is a doctor.
4. _____________ is your mother?  She is very well, thank you.
5. _____________ is the eraser?  One yuan.