Questions & Answers about O espírito está tranquilo.
O is the masculine singular definite article, meaning the.
So o espírito = the spirit.
In Portuguese, articles are used very naturally and often more regularly than in English. In this sentence, o tells you we are talking about a specific spirit, or about the spirit as a known idea in context.
- o = masculine singular
- a = feminine singular
- os = masculine plural
- as = feminine plural
Because espírito is masculine singular, it takes o.
You usually learn the noun together with its article: o espírito.
Even though many nouns ending in -o are masculine, the safest habit is to memorize nouns with the article, because endings do not always guarantee gender in Portuguese.
Here:
- o espírito = masculine
- so adjectives that describe it also need to be masculine singular
That is why the sentence says tranquilo, not tranquila.