Как долго ты учишь язык? — я учу язык два года. как долго ты читаешь эту книгу? — я читаю эту книгу уже месяц. как долго ты смотришь телевизор? — я смотрю телевизор два часа. как давно ты меня ждешь? — я жду тебя уже час. с каких пор она работает в банке? — она работает в банке с 1999 года. с каких пор он живет в москве? — он живет в москве с рождения (since he was born.) с каких пор они строят дом? — они строят дом с год

How long have you been learning English?

I have been learning English for two years.

How long have you been reading this book?

I have been reading this book for a month already.

How long have you been watching TV?

I have been watching TV for two hours.

How long have you been waiting for me?

I have been waiting for you for an hour already.

Since when has she been working in the bank?

She has been working in the bank since 1999.

Since when has he been living in Moscow?

He has been living in Moscow since he was born.

Since when have they been building the house?

They have been building the house since last year.