Learn English Grammar: Must VS Have to រៀនវេយ្យាករណ៍ភាសាអង់គ្លេស

Learn English Grammar: Must VS Have to រៀនវេយ្យាករណ៍ភាសាអង់គ្លេស We use both "must and have to" to talk about something which is obligatory or necessary to do. Ex: You must study hard. You have to study hard. Ex: We must go now. We have to go now. Must vs Have to Must - obligation from the speaker Have to - External obligation Doctor: You must stop smoking. Smoker: I have to stop smoking. Smoker: I must stop smoking. Must is a modal verb. Have to is a normal verb. Have to can be used will all tenses.