This room needs cleaning up.这个句子中的clean为什么是ing 形式?

This room needs to clean.用法对么? This room needs cleaning up.这个句子中的clean为什么是ing 形式? your room needs to 如上 This plant needs( )water This friengship needs some This firendship needs some Your room needs ________(clean)at once. The room needs cleaning.有哪些成分 This firendship needs some work “Whose room is this? He needs cleaning his room first.病句改错 The room needs cleaning 哪个是主谓宾语 My room needs cleaning.cleaning是动名词,还是现在分词? The room needs cieaning every day(改同义句) this love needs hard work to work This friendship needs some work中文意思 The room needs cleaning once a week和The room needs to be cleaned once a week.有什么区别 He needs to clean the room(对clean the room提问）