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I cut my hair. 我自己剪了自己的头发。
I had my hair cut. Someone cut my hair.

Have something done
别人帮我们做，不是我们自己

I washed my car.
I washed my car myself.
我自己洗了自己的车。
I had my car washed.

I paid someone to wash my car for me.
我花钱让别人帮我洗车。

She's having her house redecorated.
她正在（让别人）重新装修房子。