I got my car fixed.

What does it mean ? The fixing of car was done by me or somebody else did it for me?

I am tired by this work.

Is here "tired" an adjective?

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Comments  (Page 2) 
I was more thinking of "I had my son/my boyfriend do the dishes"
It's hard to coax either of them into that...
PS: Jim's right 'way back there-- I got my car fixed can be either my own accomplishment or the arranged service.

Come to think of it, so can 'had': 'I had my homework finished by 8:30, so I could watch Terminator 3 on TV last night'.
Students: We have free audio pronunciation exercises.
By the way, no, I'm not familiar with that episode in Tom Sawyer...