Exercises: modal verbs
Ejercicios de verbos modales V
Reescribe las siguientes oraciones colocando el verbo modal marcado en verde en afirmativo o negativo, según corresponda.
You should be polite.
I don't (do not) have to pay immediately.
You ought to do exercise every week.
We mustn't (must not) waste our time.
We have to be careful with the environment.
You should be on time at work.
We might study French next year.
I can't send him a text message.
We should open the window.
He mightn't go out.