We use must + infinitive to talk about obligation., T, We use mustn’t + infinitive when something is not necessary., F → It means something is not allowed / prohibited., We use don’t have to + infinitive when something is not necessary., T, Mustn’t and don’t have to have the same meaning., F → mustn’t = prohibited; don’t have to = not necessary., We can use have to to talk about rules and regulations., T, We can use need to + infinitive to talk about something that is necessary., T, We can use must to talk about an obligation we impose on ourselves., T, We can use have to and need to in the past., T, We can use must to talk about past obligations., F → For past obligations, use had to., Needn’t + infinitive means that something is not necessary., T, Mustn’t means that you are not allowed to do something., T, Don’t have to means that you are not allowed to do something., F → It means something is not necessary., Have got to is commonly used in spoken British English., T, After must, mustn’t and needn’t, we use to + infinitive., F → We use the infinitive without to: must go, mustn’t go, needn’t go., After have to, need to and don’t have to, we use the infinitive without to, F → After have to / need to / don’t have to, we use to + infinitive: have to go.

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