Réponse :
1. because she can't find her keys
2. because I (John) can't answer this question
3. because I (Betty) can't speak to him
4. because she can't sleep
5. because he can't open the door
6. because they can't see the film
7. because they can't do their exercises
8. because he can't go to the cinema
Explications :
j'espère que c'était ça ton exercice, il n'y a pas de consigne claire (je pense qu'il faut utiliser can't à chaque phrase)