pessoas

plural of pessoa

estão

third-person plural present indicative of estar

sentadas

• Adj

  feminine plural of sentado

• Noun
• Verb

do

Contraction of de o (“of the, from the, -'s (masculine singular)”).

lado de fora

outside

fora de

1. outside (on the outside of)
2. out of (towards the outside of)

um

• Num

  one

• Article
• Noun
• Pron

prédio

1. edifice (a building, especially an imposing one)
2. a large, multi-story building with rooms or floor belonging to different people or used for different purposes, such as an apartment block or skyscraper