1. I am your student from last year.
2. I was your student from last year.
3. I am your student last year.
4. I was your student last year.
5. I am your student of last year.
(Which ones are correct?)
1. I am your student from last year. Somewhat OK
2. I was your student from last year. No; remove "from" and it'll be fine.
3. I am your student last year. No. The verb is in present tense, so "last year" doesn't make sense.
4. I was your student last year. This one's the best!!
5. I am your student of last year. It's OK, but #4 is perfect!
(Which ones are correct?)