Present Perfect Continuous

2 hours!
She has been doing her homework since morning.

I haven’t been waiting for you for 2 hours!
She hasn’t been doing her homework since morning.

?

Have you been waiting for me for 2 hours?
Has she been doing her homework since morning?

have been waiting here for over half an hour and nobody has taken our order yet.
Michele: I think you’re right. He has walked by us at least twenty times. He probably thinks we have already ordered.
Robin: Look at that couple over there, they have only been here for 5 minutes and they already have their food.
Michele: We have been sitting here for over half an hour staring at him.
Robin: I don’t know if he has even noticed us. He has been running from table to table taking orders and serving food.

do the shopping
He/ write a letter
I/ learn English/ since I was 7
Jane/ make a to-do list
I/ chat with friends online