Have had or has been can be challenging to grasp, if you do not know how to use and apply the grammar rules in English. "Don't have to," "don't need to" and "mustn't" have very different meanings. “would have been” in a sentence * I would have been nicer to the lady behind the counter if she had not have been such a bitch. I must say, you look really well! (= He must finish the report by Friday) They have to resit the test. The phrase have to doesn’t look like a modal verb, but it performs the same function. I must do this right now! In this lesson we will go through an example of have, had and has been being used. However, "must" is generally used for strong personal obligations and "have to" is used for responsibilities at work and in everyday life. * We would have been on time for the party if the cop had not pulled us over for speeding. 3. (= you must study) He has to finish the report by Friday. I have to file reports every week. Guys who have been there and know what it takes to win. Together we will anaylse why they are being used in these sentences and how you can use them when speaking in English. have been there in a sentence - Use "have been there" in a sentence 1. Modals Rules: How to Use Must, Have to, May, and Might. Sometimes, "must" and "have to" can be used to speak about responsibilities. 'She must be tired' implies that she is tired now. It's not impossible to say 'She walked for two hours' when speaking of a walk that has recently finished, though as a British English speaker I would probably say 'She has been walking for two hours'. Must can be replaced by Have to with little difference in meaning: You have to study. I must say, this food is delicious! 2. (= They must resit the test) Have to is a more informal while Must is mostly used in written orders or instructions. Must vs. Have to. We’ll start with two common modal verbs: “must” and “have to.” Rules for the Modal Verbs Must and Have To. (note: in this sentence, we would not say ‘I must admit, this food is delicious!’ because it would mean that we did not expect the food to be delicious. Must - English Grammar Today - a reference to written and spoken English grammar and usage - Cambridge Dictionary This would sound a little rude!) I thought there was already an answer here, but it must have been my imagination. Have you been on holiday? I must admit, I didn’t like him much when I first met him. To create a sentence, just use your imagination. 4. The modal verb must is used to express obligation and necessity. 'She must have been tired' assumes that the walk took place in the past and the walker was tired at the end of it. He would have liked to have been there a few minutes earlier.