I'm really hungry. I ___ since this morning. (not eat)
haven't eaten
We didn't want to watch the film because we ___ already ___ it. (see)
had (already) seen
How long ___ at this company? (you/work)
have you been working
I think by the year 2050, a lot of animals ___ extinct. (become)
will have become
I ___ Ella for two years. (know)
have known
She arrived late but luckily the lesson ___ yet. (not start)
hadn't started
I can't meet you at the same time next week as I ___ an exam. (do)
will be doing
My sister ___ always ___ my clothes without asking me. (borrow)
is (always) borrowing
More and more people ___ vegetarians these days. (become)
are becoming
He ___ his lessons for the last few months. (not attend)
hasn't been attending
They ___ for hours when they decided to stop for a break. (drive)
had been driving
Sorry, I ___ a shower when you called me. (have)
was having
A: "Has Tina woken up yet?"; B: "No, she ___ still ___." (sleep)
is (still) sleeping
A: "Why are you so dirty?"; B: "I ___ out the garage." (clean)
have been cleaning
Sorry I was late picking you up. ___ there long? (you/wait)
Had you been waiting
I can smell cigarettes. ___ in here? (anyone/smoke)
Has anyone been smoking
