#english_language 

## Must
- when we say that it is necessary to do something because *the speaker* decides it is necessary ^53c6a3
- ![[Should and ought to#^8bdd5e]]

## Have got to
- when we say that it is necessary to do something because *someone else* or some outside circumstances or authority makes something necessary
	> I have to see the head teacher
- when we talk about a necessity that is characteristic of a person
	> She has to drink two cups of coffee in the morning before she feels really awake
- to derive conclusions in informal speech
	> Look at all those penguins, there's got to be about a million of them!
- we use have to instead of have got to with frequency adverbs (always, never, etc) and in formal English
	> I often have to work at the weekend to get everything done
- with the past simple, we use had to, particularly in questions and negative sentences
## Both
- when we say that it is **necessary** to do something, we use must or have (got) to or need to ([[Will and would|will]] have to in the future)
	> Every animal on the island must / has (got) to be destroyed
	##### Notice that have got to is much less formal