Have to for obligation and need to for necessity
Modal Verbs of Obligation and Necessity 1. Use of Modal Verbs of Obligation and Necessity Modal Verbs can be used to talk about obligation, freedom and necessity to do something. We use the following modal verbs: Must , Have to , Need to , Don’t have to , Needn’t, Don’t Need to + infinitive 2. Talking about Obligation and Necessity in the present 2.1 Obligation Have to and must are both used to express obligation. There is a slight difference between the way they are used. Have to shows us that the obligation comes from somebody else. It’s a law or a rule and the speaker can’t change it. In Britain you have to wear a seat belt when you drive Must shows us that the obligation comes from the speaker. It isn’t a law or a rule. I must finish this before I go home Sometimes if the speaker agrees with an external rule they will use must In Britain you must wear a seat belt when you drive. Need to have to and need to are often used in the same c
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