![]() ![]() With ‘ don't have to ' we are talking about the fact that there is no obligation to something because often there is a choice. People mustn't smoke near gas ( It is very dangerous so do not smoke here, it's your responsibility ) You mustn't wear shoes in my house ( You have a strong responsibility not to wear shoes here) Subject + must not + bare infinitive + object We are describing a strong obligation not to do something. The negative forms of ‘ must ' and ‘ have to ' are not direct opposites of the positive forms. ![]() They have to pay to use the bicycles ( You cannot just take the bikes, there are rules about paying from the company that has the bikes) She has to wear a uniform at work ( Wearing a uniform at work is a strong rule at this workplace) ![]() Subject + have/ has to + bare infinitive + object People must feed their children properly ( Parents have a responsibility to feed their children) He must do more homework to do better in class ( To improve, this student has a responsibility to himself to do more homework) Subject + must + bare infinitive + object ‘ Have to ' is used to when the obligation comes from the outside of the speaker. Sometimes the difference in meaning is not always clear but a rule to follow is that ‘ must ' refers to personal obligation, the speaker has decided that this situation is important to them or it is very necessary. When we want to discuss obligation, that is things that are necessary or important, in the present we use ‘ must ' and/ or ‘ have to '. ![]()
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