Какие предложения написаны неправильно, а какие правильно?

1. Tom, which was a manager, now are homeless.
2. I wish I hadn't gone to the party yesterday.
3. If I were you, I would read more.
4. While my sister played computer games, I was help my parents.
5. You mustn't do your homework today. You don't go to school tomorrow.
6. We arrived at the station after the train had left.

1. Tom,WHO was a manager, now IS homeless.2. I wish I hadn't gone to the party yesterday.3. If I were you, I would read more.4. While my sister WAS playING computer games, I WAS helpING my parents.5. You mustn't do your homework today. You WON`T go to school tomorrow.6. We arrived at the station after the train had left.