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。