Modal Verbs: Obligation

Modal Verbs: Obligation

• Obligation,/ Necessity -> Have to/ Must + Infinitive
• General, external obligations (rules and laws) -> Have To
• Specific, personal obligations (on one ocasion) -> Must
• Strong recomendations -> Have to, Must
• Have To is a normal verb, exist in all tenses
• Must is a modal verb, only must and musn't
• Examples:
• "You have to wear a seatbelt in a car."
• "Sarah has to bring her uniform."
• "Do you have to work on Saturdays?"
• "I will have to get up early tomorrow."
• "I must remember to phone Emily tonight."
• "You must be on time for class tomorrow."
• No Obligation/ Necessity (you can only if you want to,)-> Don't Have To + Infinitive
• Examples:
• "Sarah doesn't have to play soccer., if she doesn't want to."
• "You don't have to pay for the tickets. They're free."

Modal Verbs: Obligation

• Prohibition (against the law) -> Musn't + Infinitive
• Can use Can't/ Not Allowed to instead of Musn't
• Examples:
• "You musn't eat the cake - it's for the party."
• "You musn't smoke inte the cafe."
• "You can't park here."
• "You are not allowed to park here."
• Advice or Opinion (you think something is right or wrong to do) -> Should/ Shouldn't + Infinitive
• Is a modal verb. Only Should or Shouldn't.
• Can use Ought To to instead of Should
• Had Better -> strong advice
• Had Better Not -> Warning
• Examples:
• "You should take warm clothes with you to Dublin. It might be cold at night."
• "I think the government should do something."
• "You ought to take an umbrella with you."
• "We had better eat before the movie."
• "We had better not go to the movie hungry."