-Expresar obligación - Expressing obligation
- MUST. ("Deber") - Indica una obligación fuerte, pero de tipo moral. Es una obligación que conlleva una elección personal
I must study hard for this exam.
You must read this book. It is so good.
-Es un verbo que no añade -s en 3ª persona del singular y que no necesita verbo auxiliar para negar o preguntar.
- MUSTN'T - Indica prohibición.
You mustn't smoke here
You mustn't step the grass
- HAVE TO - ("Tener que") - Indica una obligación que viene de una ley, una norma. Es una obligación ineludible
We have to wear masks at school
You have to be 18 to buy alcohol in Spain
-Have to sí se conjuga como un verbo normal y añade -s en 3ª persona de singular y necesita auxiliares para negar y preguntar.
- DON'T HAVE TO/DOESN'T HAVE TO. ("No tener que") - Indica que no hay obligación, ausencia de obligación.
I don't have to work today, it's Sunday.
I have tickets, she doesn't have to buy one.
Practica: must/have to, mustn't/don' have to
Fill in the blanks with MUST / MUSTN'T / HAVE TO / DON'T HAVE TO
- We ________ wear a uniform to school
- She __________ to study for her exam
- I __________ to go to the dentist tomorrow
- They ___________ to be quiet in the library
- He ______________ eat more vegetables
- She _____________ clean her bedroom if she wants to go out
- We __________ be at the airport at 6 am
- You ___________ to worry. Everything will be fine
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