We have been decorating our house since five o'clock – Мы украшаем свой дом с пяти часов.He has been reading the book for three hours– Он читает книгу три часа.Carmen has been working on the projectsince morning – Кармен работает над проектом с самого утра.I have been waiting for him for several hours– Я жду его уже несколько часов.