my watch doesn't work.i must have my brother[------]it 为什么写r

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my watch doesn't work.i must have my brother[------]it 为什么写repair

您好!
my watch doesn't work.i must have my brother[------]it 为什么写repair
这里是考察一个固定短语
have sb do sth,表示让某人做某事,所以后面是动词原形哦
另外补充：后面的句子也等于
I must have it repaired by my brother这里是have sth done表示让某物被做,这里是让我们手表被我的哥哥修
祝你学习进步O(∩_∩)O哈!
再问： my watch doesn't work.i must have my brother[------]it 为什么写repair 这里不可以写repaired 对吗？这里是have sb do sth是吗？have sth done是用于其他句子吗？
再答：你好！这里不可以是repaired，因为have 后面的是my brother是个人，而如果像我说的have 后面是my watch，那么就是被修了，所以用被动repaired

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