Question

completa las siguientes frases con must, must n't, have to, don´t have to ó doesn't have to
1. My mother ________ forget to turn the lights off before she goes to bed.
2. the boys _______play the game in the afternoon.
3. those students ______ have a visa if they want to travel to the U.S.A

Answer 1

LA PRIMERA ES DONT ,

Answer 2

1. Mustn't
2. Have to/ don't have to (ambas opciones valdrían)
3. Must

Espero haberte ayudado
Saludos!