Объяснение:
1. We have known each other for four years.
2. I always wanted to learn English.
3.Where is Nina?
- She's been home for two hours.
4.Where are the children?
-They are still playing in the yard.
5. My brother has been an engineer for three years.
6. My friend knows English from childhood.
7. I've been watching you for half an hour.
8. Is your brother still sick?
"No, he’s already got better. He’s been studying physics for three days. He wants to get an excellent grade in the exam."
10. I've been trying to find my old notebook for twenty minutes
Computers offer wonderful opportunities for everybody. Many teenagers enjoy using their computers. They make new friends and chat with them on the Internet.
But on the other hand, children who spend a lot of time at the computer, spend little time in the open air, they have virtually no real communication with peers. Many teachers in schools note the limited knowledge of children, lack of interest in reading books. Children sit in front of their PC or laptop (notebook) for hours and it’s bad for their eyes! They can’t stop playing cruel and silly games and become nervous and tired. The computer is sometimes a mere waste of time. Parents are concerned that the children using the Internet are not protected from negative information, which can be found on many sites. Computers are dangerous and addictive.
But besides many disadvantages in using the computer by children, there are of course some advantages too.
Regarding the education of children on the Internet, children can find all the necessary information that is not given even in the textbooks. The main condition - to be able to properly use the Internet resources, then the child will only benefit from the computer. Then the Internet helps greatly in children’s studies. They find the necessary information and ideas on the net and use them in their work. The computer helps them both to relax and to get a lot of new interesting information.
To my mind, it’s a useful gadget.
