Causetive Form

Form
Have + object + verb 3 (past participle) - have something done 
Have + object + infinitive -- have someone do something

Meaning
We use causative when arranging for someone to dosomething for us.
They had their car repaired. (They arranged for someone to repair it)
Compare: They repaired their car. (They did it themselves)
I had my hair cut yesterday. (I went to the hairdresser)Compare: I cut my hair yesterday. (I cut it myself)
We use causative when someone does something to us.
Bill had his money stolen.
We can use have someone do something to talk about givinginstructions or orders (more common in American English).
I had my assistant type the report.
I'll have my lawyer look into it.

Additional points
Get is possible instead of have, usually in informal spokenEnglish.
I'm going to get my car fixed tomorrow.
Teaching ideas for causative
How do you teach causative? Add your idea »
Delia
I ask students to imagine they were rich and could have all sortsof things done for them, annoying everyday chores that nobody likes doing plus some luxury pampering that money allows for.

I give a few examples of my own:

I'd have my nails done once a week.I'd have my garden weeded and my lawn mowed.
I'd have my bedroom redecorated in beautiful oriental sumptuous colours and fabrics.
I'd have the evening meal cooked by a professional cook. 
I'd havemy shopping done and the house cleaned from top to bottom every two days. 

This would leave me time to do the things I enjoy, like reading, chatting to friends, going for walks and playing tennis.Causative verbs express an action which is caused to happen. In other words, when I have something done for me I cause it to happen. In other words, I do not actually do anything, but ask someoneelse to do it for me. This is the sense of causative verbs. Intermediate to advanced level English learners should study the causative verb as an alternative to thepassive voice.
Causative Verbs...