i must have my car repaired 为什么要加 have?P 178

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have sth done 使……被做
======以下答案可供参考======
供参考答案1:
have sth done 让…被做
我必须让我的车被修好，即我必须修好我的车。
供参考答案2:
have sth. done使某物被做，固定结构
供参考答案3:
如果是自己修，就是i must repaire my car.
如果是别人帮你修，就是i must have my car repaired.
就像 i must have my hair cut.意思是我要去剪头发了，当然是别人帮你剪咯。