Réponse:

Must

Musn't

Needn't

Musn't

Musn't

Must

Explications:

La première avec la derniere

2eme avec la 1ere

3eme avec 3eme

Dernière avec deuxième

You're allowed to walk on the grass

You're not allowed to skate on the lake

You're not allowed to have a picnic on the park

You're allowed to ride a bike

Have to

Don't have to. Have to

Has to

Has to