(I started waiting for his email at 1:00 – it's still not here) I ……………………………………….. waiting for his email since 1:00
have been
(It was easy to learn to use my new computer last month) Last month, I ……………………………………….. how to use my new computer – it was easy.
learned / learnt
(This time, I remembered to turn off my phone before my interview) This time, I ……………………………………….. forget to turn off my phone before my interview.
didn't