Time words

1. I want to go to shopping today but prior to I have to go to school.
2. I want to go to go shopping today but prior to (that, going, shopping) I have to go to school.
3. When I back home, subsequently, I prepared dinner.
4. When I go back home, subsequently, I prepared dinner.
5. I have two classes today. Former is writing class and the latter is lab classes.
6. I have two classes today. The former is writing class and the latter is lab classes.
7. I will go to prior to cinema.
8. I will go shopping prior to going to the cinema.
9. Prior to doing homework, I usually eat some cookies.
10. From the Swiss Challet and Mandarin restaurants, I prefer the latter.
11. Prior to coming to Canada, I thought life would be easy there.
12. Prior to writing TOEFL, I must go to a TOEFL class.
13. The food fell on me and subsequently I went to wash myself.
14. From these two dishes, I like the former.
15. I came to my home. Subsequently, I prepared dinner.