Questions & Answers about El árbol murió.
Because árbol is a specific noun here, and in Spanish singular countable nouns normally need an article or another determiner.
- El árbol murió = The tree died
- Just Árbol murió would sound incomplete or wrong in normal Spanish.
Spanish often omits subject pronouns like yo, tú, él, but it does not usually omit articles before nouns like this.
Grammatical gender in Spanish is not always predictable from meaning. While many masculine nouns end in -o and many feminine nouns end in -a, lots of nouns do not follow that pattern.
Árbol is simply a masculine noun, so it takes el:
- el árbol
- los árboles
You usually have to learn the gender together with the noun.
Murió is the preterite form of morir, third person singular.
So it means:
- he/she/it died
- the tree died
The preterite is used here because the sentence refers to a completed event in the past.