介绍:

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。