have sth to be done/have sth done?为什么要用have anyting to be done?

Question

have sth to be done/have sth done?
为什么要用have anyting to be done?

Answer 1

have sth done 意思是做了某事.
eg:I have my hair done this morning.
今天早上我去剪了头发
have sth to be done 意思是有某事将要去做.
eg:I have several exams to be taken next week.
下周我要考很多科试.
(这是高中常考的试题)