Unit 20 Mainly revision
（一）按句后要求转换句子。
　1.She goes to the cinema once a week,______ ______?(改为反意疑问句)
　2.He has few friends here,______ ______?(改为反意疑问句)
　3.We’ve been to the museum before.(改为否定句)
　　We______ ______been to the museum before.
　4.Must we finish the work before twelve o’clock?(给出否定回答)
　　No, you______.
　5.I’ll call you when I get home.(改为同意句)
　　I’ll call you______ ______ ______I get home.
　6.He has to tidy his bedroom.(对划线部分提问)
　　______ ______he______ ______do?
　7.I have something to do today.(改为一般疑问句)
　　______you have ______to do today?
[答案] 1.doesn’t she 2.does he 3.have never/not 4.needn’t
　　 5.as soon as 6.What does, have to 7.Do, anything
[说明]
　　第1题：根据前否后肯的原则，一般现在时主语是第三人称单数的否定形式的简短提问是：doesn’t she?
　　第2题：few意为：“少数，几乎没有”。有否定意味，根据前否后肯原则，一般现在时主语是第三人称单数的简短提问形式是：does he?
　　第3题：been to意为：去过某地。它的否定式是在前面加not或never。