Find the mistakes and correct the sentences. There may be more than one mistake in a sentence.

1. When Joe in college, he was used to study very hard.
2. Last year he used to study very hard
3. We can't afford buy a new car right now.
4. During the meeting we stopped calling Ms Thomson: we didn't want to waste time to discuss things we didn't know anything about.
5. Did she used to fall behind with her homework?
6. Kate couldn't log in because she forgot the password.
7. If your boyfriend would forget your birthday will you make a big fuss?