Nearly two thousand years ago, in 79 ad, a volcano called vesuvius erupted on the west coast of italy, south of naples. it was one o’clock on 24th august. in the busy roman port of pompeii, people were walking about in the streets, families were preparing lunch and children were playing. suddenly vesuvius erupted. there was a loud explosion. there was dust and ash everywhere. people rushed into the streets screaming. children ran to their parents crying. people tried to run away, taking their things with them. they tried to escape, but most of people and animals died. vesuvius has erupted many times. the last big eruption was in 1944. will vesuvius erupt again? nobody knows. if it does, it might be a small eruption or a big one. some people live close to vesuvius because the soil around it is good for growing crops. but it is also very dangerous.
Утвердительное. S have/has been Ving (глагол в ing'овой форме). Например, They have been playing tennis for two hours - Они играют в теннис уже два часа. FOR - это продолжительность действия. FOT TWO HOURS - это два часа.
Отрицательное. S have/has not been Ving. He has not been playing tennis for two hours.
Вопросительное. Wh? (вопрос) have/has S been Ving? How long have they playing?
Кроме FOR, в past perfect progressive используют SINCE (с какого-то момента). К примеру, He has been writing a letter since 5 o'clock - Он пишет письмо с пяти часов. Или: They have been talking since morning - Они разговаривают с самого утра.
Что сказать о собой форме Present Perfect Progressive? Она используется только на письме. Ну, редкие случаи бывают, когда используют в разговорной речи, но это редко и только в случае вопроса по типу how long have thay Ving (что-то делают)?
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