1) I have lived here since 1999. 2) He has worked there since May. 3) They have been friends since they started college. 4) We have known him for three years. 5) They have lived in our house for two years. 6) She has been ill since Friday. 7) I have't been in London since I have been a child. 8) I left Kyiv last year and I have't to seen him for(если на протяжении какого-то времени)/since(если с определенного времени. (я так понял Вы тут не дописали) 9) He has studied French for ten years. 10) My mother has worked in the factory for some years. 11) They have lived in Brazil since 1960. 12) I have't seen him since this Tuesday. 13) He has been in prison now for five years. 14) She has't heard about them for almost a year. 15) I have known nothing about him for several month.
Today the Internet is very popular. It helps people in studying, communicating as well as in learning news and relaxing at their free time. No doubt it is very useful. Students may find there extra information. Some people study online or prepare for exams. There are a lot of educational resourses on the net. They can find a lot of special tests on the net and interesting video lessons on all the subjects on the free site such as Youtube, for example. But the Internet might be very dangerous. There are many web-sites with bad or wrong information, or some bad files, which can break user's computer.
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