1 .昨晚我写了一封信.
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2 .你介意我开窗户吗?
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3 .他指出我作文中的错误.
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4 .我们必须派人去请医生.
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5 .写完作文后,我们必须检查一遍.
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1. I wrote a letter last night.
2. Do you mind my opening the window?
3. He pointed out the mistakes in my composition.
4. We must send for a doctor.
5. After writing a composition,we must go over it.