want sth done 想要完成某事 动作发出者 是本人
want sth to be done 是想要某事被完成 动作发出者 是他人
want sth done是说“想要别人做某事”
给你举几个例子:
i want my car repaired tonight.
i want your hair cut immediately
want sth to be done是说“想要某事被完成”
是want to do sth ,wanna do sth 某人想要做某事
want sth to be done某人想要某事被做