Your window wants cleaning这是什么语法现象?为什么不用to be cleaned?

1)wash,clean,cook,iron,look,cut,sell,read,wear,feel,draw,write,sell,drive…
The book sells well.这本书销路好.
This knife cuts easily.这刀子很好用.
2)blame,let(出租),remain,keep,rent,build
I was to blame for the accident.
Much work remains.
3) 在need,require,want,worth (形容词),deserve后的动名词必须用主动形式.
The door needs repairing.= The door needs to be repaired.
This room needs cleaning.这房间应该打扫一下.
This book is worth reading.这本书值得一读.
4) 特殊结构：make sb.heard / understood (使别人能听见/理解自己),have sth.done ( 要某人做某事).

动词need,require,want作“需要”解,其后跟动词作它的宾语时,若表示的含义是被动的,必须用动名词,或不定式的被动式。例如：
The window needs(requires, wants)cleaning(to be cleaned).
语法点就这些 有问题可以私下交流
乐趣中学习

祈使句

want /need 都有后面家上doing 的用法
是一种主动表示被动的用法，若是用to be done 也是没错的

没见过...

不说： Your window wants cleaning
而说：Your window needs cleaning