Ответ:
1. I have not forgotten her telephone number.
Pupils have written their tests.
My sister has gone to the theatre many times.
Our classmates have joined the sport club.
You have opened the window, and it is very cold in the classroom.
2. Have you ever been to Scotland?
Be quite! The performance has already begun.
Janet has never been a good student.
I just have done my homework
3.
1.c)
2.a)