Questions & Answers about La reparación empieza mañana.
Because reparación is a feminine noun in Spanish, so it takes the feminine definite article la.
A very common pattern is that nouns ending in -ción are feminine:
- la reparación
- la estación
- la situación
- la conversación
So the article has to agree with the noun:
- la reparación empieza
- not el reparación empieza
The accent mark shows which syllable is stressed.
So reparación is stressed on the last syllable:
- re-pa-ra-CIÓN
Without the written accent, Spanish stress rules would suggest a different stress pattern, so the accent is necessary.
It is also a good clue that this word is related to many other -ción words, which often correspond to English -tion words:
- reparación → repair / reparation
- información → information
- organización → organization