ANA LUISA

ANA LUISA

Must, have to, need to, can.

must

• Must is used to express obligation, give orders and give advice. It can only be used for present and future reference. When the past is involved, you use have to. Must is used: to express obligation.

have to

• Have (got) to is used to refer to obligations which come from outside the speaker:

• Spoken English:

  
  

  In speaking, have got to is more common than have to when talking about obligation

exercise

https://learnenglish.britishcouncil.org/grammar/intermediate-to-upper-intermediate/modals-permission-and-obligation

https://www.thoughtco.com/must-have-to-and-need-to-in-english-4177288