посчитайте прошу номер 3

2) My teacher is very tall. My teacher isn't very tall

3) I am 16 years old. I'm not 16 years old.

4) My friends are all girls. My friends aren't all girls

5) It's very cold today. It isn't very cold today

6) My friends and I are in an English lesson. My friends and I aren't in an English lesson