Forklar hvorfor det er en fejl?

Jeg skal i følgende sætninger finde fejl og rette dem - hvilket jeg har gjort. Desuden skal jeg forklare hvorfor det er en fejl. Anyone der kan hjælpe mig? 

1. I look forward to see you again next sunday.
- I am looking forward to seeing you again next sunday.
2. This dog dont obey his master
- This dog does not obey his master
3. I here what you say but I simply cant believe it.
- I hear what you are saying but I simply can't believe it.
4. He lent his fathers car but he forgot to return it.
-He lent his father's car but he forgot to return it.?
5. I am afraid of that we shall bee late for the show.
- i am afraid that we will be late for the show.
6.He had many money but not many friends.
- He had a lot of money but not a lot of friends.
8.Give me your money. I need them for a birthdaypresent.
-Give me your money; I need them for a birthday present.
9.They played well and succeded to win the price.
- They played well and succeeded to win the prize.
10. People say that cats has nine lives and they are good to take care of themselfs.
- People say that cats have nine lives and they are good at taking care of themselves