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
The most loyal Pets-dogs. They can be taught to stand on their hind legs, to force to flee to the owner. Dogs were the first to fly in space. The whole country will never forget the two heroes Squirrel and the Arrow.
Neither one pet the owner does not rejoice as I rejoice dogs.
Also, these four-legged Pets can save millions of lives. After all, people learned dogs come to the rescue. They are helping to find criminals, put out fires, to treat people.
That's how dogs are. Here it is friends!