Помогите пожалуйста ,очень надо

each of these sentences has a grammar mistake. Find the mistake ,then write the correct sentence.
1.I didn't went on holidays last year
2.when did you bought your car?
3.who do you meet at the party?
4.how much did you paid for the ticket ?
5. Stephan and Marty come did not to school yesterday.
6. When started you to play hockey?
7. Why didn't you came on time?
8. How often they visited you?

1.I didn't go on holidays last year2.when did you buy your car?3.who did you meet at the party?4.how much did you pay for the ticket ?5. Stephan and Marty did not come to school yesterday.6. When did you start to play hockey?7. Why didn't you come on time?8. How often did they visite you?