1. He killed him.

2. He killed himself.
(Can we use both sentences. I think they have different meaning.)

3. You should take care of yourself.
4. You shoud take care of you.
(Are both OK? Is #4 wrong?)

5. He looked at himself in the mirror.
6. He looked at him in the mirror.
(Are both the same? Is #6 correct? Does 'him' refer to the subject or another man?)

1, 2. They certainly DO have different meanings. 1. he killed someone else but 2. he killed himself

3., 4. They are both correct, but 3 is definitely clearer.

5., 6. Again like 1 and 2, 5. it is himself BUT 6. it could be another boy/man.

Sra