posted by rfvv .
1. He is my old friend.
(Can we use this one when one of my friends is very old though I met him one week ago?)
2. My favorite class is math class.
3. My favorite class is a math class.
(Which one is right? Are both right? )
4. I do my homework with her after school.
5. I do my homework after school with her.
6. After school, I do my homework with her.
(Are the three expressions grammatical?)