Must have, can't have, couldn't have: expressing past probability Structure: modal verb + have + past participle must have been, can't have gone, couldn't have gone, etc. We had to go to bed at 8 o’clock when we were kids. Must is known as a modal verb in the English language while have to is a verb.

Must and have to are both used for obligation and are often quite similar. The meaning is: There was a feeling between us. : They must have left early. → I thought he must have been busy. (No other exits were available.) He must have already gone.

– The subject is obliged or forced to act by a separate, external power (for example, the Law or school rules) I have to leave early today. The correct form is “Must Have” but I must admit I hear or read that rarely and almost always hear or see “Must Of” recently which sounds awful. You will have to pay for the excess. The crucial difference between should, ought to and must, is based on the extent to which they emphasize, in the sense that must is the most emphatic of the trio. So, it is obvious that the degree of emphasis is least when we use should in our sentence. Must can be replaced by Have to with little difference in meaning: You have to study. Must, have to: present: past: When expressing obligation, we say: I must go. Spell checkers do not include every word in the dictionary, which is why they (typically) have a function: “add to dictionary.” Even though I knew “must’ve” was a correct spelling, my Chrome built-in checker gave me the red squiggly, so I right clicked it and went to “search Google for…” and verified it, which led me to this discussion. or I have to go. I was sure that he was busy. You must have done as I told you. Must vs. have to Both Must and have to express obligation or necessity, but there are some small differences: • Must expresses the speaker's feelings, whereas have to … MUST HAVE; Must expresses an opinion: an inference, a conclusion, based on known details. answered Jun 26 '17 at 19:05. If you want to learn more English online, you can try our courses and learn more with private teachers. Learn the differences between these modal verbs: must vs have to, and mustn’t vs don’t/doesn’t have to… All passengers must wear seat belts.

Spell checkers do not include every word in the dictionary, which is why they (typically) have a function: “add to dictionary.” Even though I knew “must’ve” was a correct spelling, my Chrome built-in checker gave me the red squiggly, so I right clicked it and went to “search Google for…” and verified it, which led me to this discussion. We use must have to express that we feel sure that something was true in the past. Have / Has to expresses general obligations. Must have, can't have, couldn't have: expressing past probability Structure: modal verb + have + past participle must have been, can't have gone, couldn't have gone, etc. To indicate something happened in the past, you would just add additional information that contains a recognizable time frame. He can't have been hungry Must have expresses an opinion about an earlier (past) situation.. A CONCLUSION: The car driver must have panicked when he saw the buses moving in on both sides.. Must vs. Have to. One more example, from a song by Roxette: It must have been love But it's over now . We use must have to express that we feel sure that something was true in the past. I must go now. The bus passengers must have heard a crunch. Have to can play the role of must in the past (had to) present, and future tenses. The modal verb must is used in expressions of obligation and necessity. If you found it useful, comment on it below or share it with your friends on social media. means practically the same as. But whatever it was, it no longer exists. On the other hand, ought to is less emphatic than must, but more than should. improve this answer. : They must have left early. I believe this feeling was love. Must vs. Have to. We use have to / must / should + infinitive to talk about obligation, things that are necessary to do, or to give advice about things that are a good idea to do. Must can be replaced by Have to with little difference in meaning: You have to study.

(= you must study) He has to finish the report by Friday. Must - English Grammar Today - a reference to written and spoken English grammar and usage - Cambridge Dictionary He couldn't have been hungry. Have To vs Must . (sound) The car passengers must have escaped out the back.