Complete the sentece: I _________ the house, it's a mess.

we use must to talk about rules and obliagtions

We use " have to" + infinitive

We use have to + infinitive to talk about rules and obligations

Complete the sentence: People _____________ quiet at the library

Must and mustn't are for all the persons

We use "must" to talk about something prohibited

We use "don't have to " to say that there is no obligation.

"must" and "have to" have completely different meanings

We can contract "have" or "has" to when talking about obligations

the sentence: She have to go to school

The sentence: She must to go to school

The sentence: I have clean the house

The sentence: I don't have to smoke at the library

I musn't work this Friday. I am happy

The use of must musn't have to dont have to is clear for me