объясните почему меняются слова в скобках: 1. i want (he) him to ...

Vasy

объясните почему меняются слова в скобках:
1. i want (he) him to be my friend
2. they would like (we) us  to learn English
3. we expect (they) them to arrive at 6 p.m.
4. she doesn't want (her daughter) she daughter to live in France
5. i would like (you) you to offer them our help
6. she heard (he) him open the door
7. tom expect (i) me to write letters every week