Your hair wants cutting.　你的头发该理了。

　　The floor requires washing. 地板需要冲洗。

　　典型例题

　　The library needs___， but it'll have to wait until Sunday.

　　A. cleaning　 B. be cleaned　 C. clean　 D. being cleaned

　　答案A. need （实意） +n /to do，need （情态）+ do，当为被动语态时，还可need + doing. 本题考最后一种用法，选A.如有to be cleaned 则也为正确答案。