Раскрой скобки и поставь глагол в PRESENT PERFECT: I (to forget) her telephone number. Pupils (to write) their tests. My sister (to go) to the theatre many times. Our classmates (to join) the sport club. You (to open) the window, and it is very cold in the classroom.

I have forgotten her telephone number Pupils have written their testsMy sister has gone to the theater many times Our classmates have joined the sport clubYou have opened the window, and it is very cold in the classroom