bonsoir est-ce que quelqu'un peut m'aider pour cet exercice d'anglais s'il vous plaît merci d'avance​

Bonjour

1- Birds can fly.

2- Can I open the door ?

3- I can't speak Chinese.

4- You mustn't eat in the classroom.

5- In 1973, you could buy the 1st cellphone.

6- May I open the door, please ?

7- In the past women couldn't vote.

8- I must work to have good grades.(interne)

9- You mustn't be late at school.

10- You have to obey the law. (externe)

11- In the future there will be  flying cars.

12- I probably won't be an astronaut.

13- You should always be careful on line.

14- You shouldn't post mean comments.

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bonne fin de soirée ☺☺☺