Hi JJ, let's go:
PRONOUNS / PRONOMES
1 Nos / Us
- Good help us / Deus nos ajude
2 Nós / We
- We have a lot of food / Nós temos muita comida
PREPOSITION (with PLURAL)
1 Nos / In (used with places, refer a reading or when something or someone is inside another)
- I was born in USA / Eu nasci nos EUA
- I read it in the newspapers / Eu li nos jornais
- I'm in my car / Estou no meu carro
2 Nos / On (used with street names and places, surfaces and objects on the top the others)
Examples:
- I forgot my coat on the train tracks / Eu esqueci mru casaco nos trilhos do trem
3 Nos / at (specifics places )
- The games will be on the stadiums / Os jogos serão nos estádios
Remember "Nos" is a plural form used to the male nouns. You can also use:
"na" - Singular female
"no" - Singular male
"nas" - Plural female
"nos" - Plural male