Преобразуйте предложения, употребляя оборот there is / are: 1. several ehglish books are on the shelf. 2. a letter is on the floor. 3. a gas-stove is in the kitchen. 4. we have twenty students in our group.

1. there are several English books on the shelf.
2. there is a letter on the floor.
3. there is a gas-stove in the kitchen.
4. there are twenty students in our group.