How to use have to in a sentence. —used to say that something is required or necessary —also have got to; —used to say that something is required by a rule or law… See the full definition Further, the word 'must' remain the same in all the three tenses, whereas have to becomes 'had to' and 'will have to', in the past tense and future tense respectively. The main difference between must and have to, is that while must is a modal verb, have to is a semi-modal verb, in the sense that as a modal verb it is used along Identify the function of must in the following sentence: "Jonathan, you must have driven through the night to have arrived so early!". a) To introduce or emphasize an opinion or sentiment. b) To indicate a strong intention. c) To express necessity. d) To express a certainty or high probability. Use 'must' to express something that you or a person feels is necessary. This form is used only in the present and future. You don't have to arrive before 8. They didn't have to work so hard. The negative form of 'have to' expresses the idea that something is not required. It is, however, possible if so desired. She mustn't use such horrible How to use them. Must means 'Do it!' If you don't do it, you will be in trouble. You must listen to the teacher. Mustn't means 'Don't do it!' If you do it, you will be in trouble. We mustn't forget our books. Use the infinitive without to after must and mustn't. Children must respect their parents. Parents must take care of their children. Vay Tiền Nhanh Chỉ Cần Cmnd.

use of must and must not