Respuestas
Respuesta:
1. Mark is able to swim / Mark is not able to swim.
2. My friend is able to understand the problem / My friend is not able to understand the problem.
3. They are able to speak English / They are not able to speak English.
4. Mary was able to dance when she was nine / Mary was not able to dance when she was nine.
5. She is able to drive / She is not able to drive.
6. You will be able to concentrate / You won't be able to concentrate.
7. Jessica is able to come tomorrow / Jessica is not able to come tomorrow.
8. Jhon and Carla are able to ride a bike / Jhon and Carla are not able to ride a bike.
9. He is able to come / He is not able to come.
10. I am able to write formal letters / I am not able to write formal letters.
Explicación:
"Be able to" se utiliza para expresar que alguien es capaz de algo o que puede hacer algo.