This room needs cleaning up.这个句子中的clean为什么是ing 形式?
问题描述：
This room needs cleaning up.这个句子中的clean为什么是ing 形式?
答
此处为主动语态表被动,need doing sth.与 need to be done.相同,只有need有用doing表被动的用法
needs cleaning = needs to be cleaned