考研英语语法速成：情态动词被动关系的主动表达法

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1． want, require, worth（形容词）后面接doing也可以表示被动意义。
    Your hair wants cutting
    The book is worth reading
    The floor requires washing.
    2．need既可以用need to be done 也可以使用need doing ，两种形式都表达被动的意义
    The house needs painting= the house needs to be painted.
    The watch needed repairing= the watch needed to be repaired.