In British English, both\u00a0must<\/b>\u00a0and\u00a0have to<\/b>\u00a0can be used to talk about necessity and obligation. Americans usually use\u00a0have to<\/b>, especially in speech.<\/p>\n
I\u00a0must\u00a0<\/b>reach home before 6 o\u2019clock.
\nOR I\u00a0have to<\/b>\u00a0reach home before 6 o\u2019clock.<\/p>\n
Note that\u00a0must<\/b>\u00a0is usually used to talk about obligations that arise from the feelings and wishes of the speaker or the listener.<\/p>\n
I\u00a0must<\/b>\u00a0go home. (Because I want to go home.)
\nYou\u00a0must\u00a0<\/b>quit smoking.<\/p>\n
Have to<\/b>\u00a0is usually used to talk about obligations that come from laws, regulations, arrangements and other people\u2019s orders.<\/p>\n
Compare:<\/p>\n
I have got toothache. I\u00a0must\u00a0<\/b>make an appointment with the dentist. (Speaker\u2019s wish)
\nI can\u2019t come to your party because I\u00a0have got to\u00a0<\/b>see the dentist at 6 o\u2019clock. (A pre-existing arrangement)<\/p>\nFuture obligations<\/h3>\n
To talk about future obligations we can use\u00a0will have to\u00a0<\/b>or\u00a0have go to<\/b>.<\/p>\n
I\u00a0have got to\u00a0<\/b>be there at 9 o\u2019clock.
\nAfter you finish your graduation, you\u00a0will have to\u00a0<\/b>find a job.<\/p>\n
Must<\/b>\u00a0can be used to give instructions for the future.<\/p>\n
You can go out if you want to but you\u00a0must\u00a0<\/b>be back before 10 pm.<\/p>\nGrammar notes<\/h3>\n
Although\u00a0must<\/b>\u00a0and\u00a0have to<\/b>\u00a0express similar ideas, the negatives\u00a0must not<\/b>\u00a0and\u00a0do not have to \/ have not got to\u00a0<\/b>have quite different meanings.<\/p>\n
Must not<\/b>\u00a0is used to prohibit.\u00a0Do not have to\u00a0<\/b>is used to say that there is no obligation.<\/p>\n
Compare:<\/p>\n
You\u00a0must not<\/b>\u00a0go. (= Don\u2019t go.)
\nYou\u00a0don\u2019t have to<\/b>\u00a0go. (= You can go if you want to but it is not necessary.)<\/p>\n","protected":false},"excerpt":{"rendered":"
In British English, both\u00a0must\u00a0and\u00a0have to\u00a0can be used to talk about necessity and obligation. Americans usually use\u00a0have to, especially in speech. I\u00a0must\u00a0reach home before 6 o\u2019clock. OR I\u00a0have to\u00a0reach home before 6 o\u2019clock. Note that\u00a0must\u00a0is...<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[1850,1626,1851,2083,2084],"class_list":["post-73190","post","type-post","status-publish","format-standard","hentry","category-speaking","tag-have-to","tag-must","tag-must-or-have-to","tag-talking-about-necessity","tag-talking-about-obligation"],"_links":{"self":[{"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/posts\/73190","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/comments?post=73190"}],"version-history":[{"count":1,"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/posts\/73190\/revisions"}],"predecessor-version":[{"id":73191,"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/posts\/73190\/revisions\/73191"}],"wp:attachment":[{"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/media?parent=73190"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/categories?post=73190"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perfectyourenglish.com\/blog\/wp-json\/wp\/v2\/tags?post=73190"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}