危险化学品柜颜色:have sth. done是啥意思？什么情况下用？

have sth. done是啥意思？什么情况下用？ have sth done的用法 have sth done是什么语态？ have sth done 的过去完成时? have sth done 为什么用done呢 德语中的‘have sth done ’怎么说啊？ have sth to do \have sth do\have sth done的区别 have sth to be done和have sth done的区别是什么？ will have done sth 与 would have done sth 有什么区别啊 have sth done和have sth been done都有吗，具体有什么区别