b)
1. Susan is new to the school.
2. I am 14 years old.
3. They are in Room E.
4. He is my best friend.
5. You are in Grade 7.
c)
1. Susan isn't new to the school.
2. I'm not 14 years old.
3. They aren't in Room E.
4. He isn't my best friend.
5. You aren't in Grade 7.