... facts or circumstances, we use must to show that we believe something is thecase or something is certain to happen. Must and negationBritish people can use must not/ mustn t to say that things ... implication of must (= obligation) is that the speaker is the person whoexerts authority over the person(s) mentioned in the clause. Consistent with this principle, I must and We must convey the ... the modal meanings expressed by must - The modal meanings expressed by must is realized by many Vietnamese equivalents.a) The first, in expressing modal certainty, must is seen as equivalent to...