Have to and must – Poslovni engleski

Introduction

Theme of my seminary paper are have to and must. We often use have to to say that something is obligatory, for example:
– Children have to go to school.
Have to is often grouped with modal auxiliary verbs for convenience, but in fact it is not a modal verb. It is not even an auxiliary verb. In the have to structure, “have” is a main verb.
“Must” is most commonly used to express certainty. It can also be used to express necessity or strong recommendation, although native speakers prefer the more flexible form “have to.” “Must not” can be used to prohibit actions, but this sounds very severe; speakers prefer to use softer modal verbs such as “should not” or “ought not” to dissuade rather than prohibit.
Must and have to both express obligation.
However, they are used differently depending on who imposes the obligation.
MUST HAVE TO
The speaker thinks it is necessary. Someone else thinks it is necessary.