Must vs have to , difference , detail

must  vs have  : difference

■ when we want to say that is Necessary or Compulsory to do something we use must or have to for present and future.

EXAMPLE:
       ● you must/have to present at       meeting today.

       ●  To get first copy of this novel,  you have to present there before 5 A. M.

■  We also use Must / Have to / Has to, when it will be necessary for someone to do something in the future. ( we can also use ‘will have to’ for this)

Example:
     ■  you have to/must/will have to submit your project work by Friday.

Must ( use)

■ We normally use Must, not ‘have to’ when we give conclusions for something has happened or something is true.

Example:  All movie halls are house full for this movie. The movie must has bumper opening.

■ Must doesn't have any other forms than present tense hence no past form and past participle form. If we want to tell something was necessary or Compulsory in past we use ‘had to’ instead of must.

Example: seema didn't reach airport. She had to leave early.

Have to/ has to

■ We use have to/ has to if someone else or some outside circumstances or authority makes something necessary but not known or internal. While ‘Must’ is use when the speaker her/him self decide it is necessary.

         Example:

● I have to go to regional   office because area head called me.

(  Above is an external pressure ,  as it was called by area head)

● I must go to regional office because I want to meet area head.( Self decision)

■ .  We use adverbs such as always, never, normally, rarely, sometimes, etc. With have to/ has to.

Example:

●  I sometimes have to get up early morning for my extra classes.

●  she always has to take care of her siblings due to absence of guardian.

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