In informal English, have got to is sometimes used instead of have to. Though the version with will have to is much more common. However, sometimes Must is also used to express future obligation. In spoken English we would use the contraction I’ll instead of I will. I will have to leave work early tomorrow.
The future tense of Must is Will have to:
She had to give a presentation to her boss. I had to pay my speeding ticket yesterday. We use a form of have to for the other tenses. Must is only used in the present tense and sometimes to express the future. Do you have to leave right now? (Much more common in general spoken English). Must you leave right now? (Possible, though rare. Note however that you may still hear MUST used in questions, though mainly in British English. Normally, you will not hear someone say “When must you finish the report?” as it doesn’t sound natural. In both examples you would not use MUST because we are talking about someone else’s obligations.įor questions it is much more common to use Have to instead of Must (Must sounds very formal): They both have the obligation to pay their rent on that day. Susan and Steve have to pay their rent every Friday. It is Mike’s obligation to fulfill his work commitments. Mike can’t come because he has to work tomorrow. When we mention someone else’s obligation, then we use the correct conjugation of Have to. This is because somebody else, in this case the teacher, has told us what needs to be done. Since the teacher has given us the obligation, we use have to. The teacher has used MUST because he or has is giving the students an obligation. The Student says: We have to complete the essay by Friday. The Teacher says: You must complete the essay by Friday. I, the speaker, am not making this obligation, someone else is. It is an obligation that our boss has decided that is necessary. Here I am reminding myself that it is necessary to do. 
I must book a hotel for my trip next week. Somebody else has told me to write it, somebody else told me it was necessary to do. So here, I didn’t decide to write a letter. We use have to when somebody else other than the speaker has made the decision. In this case I have decided that I need to write a letter to John. We generally use must when the speaker decides that something is necessary, or needs to be done. Let’s look at our previous example using MUST: While Must can generally be replaced by Have to in the present tense, there is sometimes a slight difference in meaning or use. MUST and HAVE TO are both used to express an obligation, responsibility or necessity. What is the difference between MUST and HAVE TO? Sometimes HAVE TO is used instead of MUST. In our last lesson, we saw how to use the modal verb MUST in English.
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