need to do、need do、need doing、neeed to be done的区别

1、need to do sth 需要做某事 例：You don't need to have the bike repaired right away.你不必马上去修车.2、need 作情态动词,后面直接接动词原形 need do sth“需要做某事” I need do my homework right now.我要马上做作业了.3、need doing = need to be done 需要……被做,这两短语没有什么区别 例：The room needs cleaning = The room needs to be cleaned.房间需要打扫了.