Explain why it is so. (тема урока the present perfect tense) объясни следующее. example: - there are no pies on the plate. john (eat). - john has eaten them. 1) - their house is now yellow! - yes, they (paint) . 2) - he knows everything about moscow. - i think he does. he (be) there many times. 3) - john, your car looks so clean! it should be! i (wash) . 4) - your grandparents are tired. yes, they (come) back from the shops. 5) - does harry know about it? - yes, i (give) him a call. 6) - is the book interesting? - i don't know yet. i just (begin) reading it. 7) - why is jason in hospital? - he (fall) off his bike. 8) - roy knows nothing about our meeting. - sorry. i (not, speak) to him yet.