We _____ (study) together since 2000.
We have been studying together 2000.
I _____ (love) my wife since we first met.
I have been loving my wife since we first met.
Since last year, how many times _____ Charles _____ (visit) New York?
Since last year, how many times has Charles been visiting New York?
I _____ (wear) the same leather jacket for 20 years.
I have been wearing this same leather jacket for 20 years.
I'm not going to Math class anymore! I _____ (understand) anything since the first day.
I'm not going to Math class anymore! I haven't been understanding anything since the first day.
I_____ (cook) for the last two hours and now you tell me you’re not hungry!
I have been cooking for the last two hours and now you tell me you’re not hungry!
I _____ (read) your book all day. It's very interesting, but I'm only on chapter 2.
I have been reading your book all day. It's very interesting, but I'm only on chapter 2.
He _____ (write) his essay all day, but he _____ (not/finish) yet.
He has been writing his essay all day, but he hasn't finished yet.
She _____ (try) to memorize French words for hours, but she still doesn't remember all of them.
She has been trying to memorize French words for hours, but she still doesn't remember all of them.
Sorry, I'm late. _____ you _____ (wait) for long?
Sorry, I'm late. Have you been waiting for long?
_____ he _____ (study) hard today?
Has he been studying hard today?
The children _____ (watch) videos for two hours.
The children have been watching videos for two hours.
How long ____ you _____ (see) Gerry?
How long ____ you _____ (see) Gerry?
My father ________ (not/smoke) since he was sick last year.
My father has not been smoking since he was sick last year.
You are filthy! What _____ you _____ (do) all day?
You are filthy! What have you been doing all day?
We _____ (not/see) Lisa recently.
We haven't been seeing Lisa recently.