3
1. I have been phoning Jane for a quarter of an hour, but the line is still engaged.
2. It is noon. You have been working on the computer for two hours already.
3. We have never been to Australia. And John has lived there all his life.
4. Sally is in the classroom. She has been airing the room since the beginning of the break.
5. My cousin has been painting this portrait for half a year. I think she will finish it next month.
4
1) Kate has been watering the flowers for half an hour already.
Вопрос: Has Kate been watering the flowers for half an hour already?
Отрицание: Kate hasn't been wearing the flowers for half an hour.
2) Mary and Ann have been planting flowers for a long time.
Вопрос: Have Mary and Ann been planting flowers for a long time?
Отрицание: Mary and Ann haven't been planting flowers for a long time.
3) You have been teaching in this school since autumn.
Вопрос: Have you been teaching in this school since autumn?
Отрицание: You haven't been teaching in this school since autumn.
Many factories and plants also pollute air and water by burning fuels such as oil and coal and throwing away their waste. This burning releases sulfur dioxide and nitrogen oxide gases, which react with water and oxygen in the atmosphere to form acids. Acid rain gets into lakes, rivers, and seas and it poisons their water. It does a lot of harm to different species of fish and plants.
Объяснение: