The ставится в случае:
1- Конретный предмет (I have bought the black camera.)
2- степень превосходства(I have bought the best camera.)
A/an ставится когда внимание обращается не на существительное а на сам факт. (I have bought a camera.(важен факт того,что ты купил камеру.))
Вроде как то так.
1.Alex is taller than Egor.
2. His teacher drinks tea
3.<span>Masha is smarter than Natasha</span>
4. What are you doing?
5. They are going to school
6.Don't speak to your friends in your language
1. They spend a lot of time together.
2. She often looks after her nephew.
3. Our parents arrange our free time.
4. I am fond of figure skating.
5. My grandmother lives on the outskirts of Moscow.
6. He studies English.
Band'Eros - Russian musical group. Became famous after the release of the single "Do not renounce" in 2005. During its existence, the band has sold more than 200 million copies of her debut album and more than 450,000 digital singles.