Question

Your hair needs to be cut.You'd better have it done tomorrow.

为什么这里不用have it to be done tomorrow?
不是说have sth. done是已完成的，而have sth. to be done是未完成的。
求解

Answer 1

Your hair needs to be cut. You'd better have it done tomorrow.
You'd better have it done tomorrow中的【have sth. done】不是【已完成】，而是【由别人完成剪发的动作】，况且句中还有【tomorrow】。你说是吗？
have sth. to be done的意思是：“sth将要被完成/未完成”
如果我帮到了你，请采纳，谢谢！

Answer 2

have sth done 让某事被做；这里的done应该是分词表被动，而不是完成时；

没有have sth to be done 的结构

追问

"Do u have anything to be typed,Professor Smith?" "No,thanks."
怎么说

追答

这里表示“有....要被打出”，与上面的结构不一样