can/can't/could/couldn't
en la clase hemos hecho un poster muy bonito sobre esto, osea que ya sabeis cosas.
aqui teneis la teoria:
| afirmative | negative | |
| present | can | can't |
| past | could | couldn't |
https://www.cuadernodeingles.com/cuaderno_mes/versionweb_mesesanteriores/cuaderno_09_ago.htm - can/can't
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-91443.php - could/couldn't