"I must go out."
Translation:Eu preciso sair.
You can use it in both cases. Ex. Tenho que sair daqui. - I have to get out of here. Ex. Vou sair com amigos. - I'm going out with friends.
In an other sentence I used precisar for "must" and it was marked wrong. Can anybody explain what is the diffrence?
At what point does 'precisar' require 'de' after? Is it for a noun, but not an infinitive?
"Deixar" is a transitive verb, that is, it requires a complement. You need to leave a place or something. "Partir" (to go away) is an intransitive verb.
If 'sair' can be used in the context like 'going out with someone' or just 'leave the place' ?
Also, if one asks you: "você está saindo com ele/ela?" It means if you are having a crush on him/her.