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1. 助动词have+过去分词构成完成时态。
I have never seen such a strange man.
我从未见过这么奇怪的人。

Yes, he has been here twice but hasn't had his hair cut yet.
是啊，他来了两次还没把头发理了。

He's gone to your house.
他去你家了。

2. HAVE+宾语+过去分词表示让某事由某人做。
Can I have my hair cut now?
你现在可以给我理发吗？

Oh, you haven't had your hair cut yet.
噢，你还没理发呀。

3. HAVE+宾语+原形不定词表示请或让某人做某事。
Or I can have my assistant help me do it.
或者我可以让我的助手帮我来做。

4. have作为本动词表示"有、拥有"的意思。
No, I don't have much time.
不行，我没那么多时间。

Oh, you still have many customers today.
噢，你今天还有很多顾客呀