Questions & Answers about O quintal da casa é enorme.
Because quintal is being used as a specific noun here: the backyard. In Portuguese, definite articles like o, a, os, as are used very often, sometimes more often than in English.
Here, quintal is:
- masculine
- singular
So it takes o:
- o quintal = the backyard
If you said just quintal, it would sound more general or dictionary-like, not like a normal complete sentence in this context.
Quintal usually means the outdoor area of a house, especially the yard behind or around it. In Brazilian Portuguese, it often suggests a practical outdoor space, not necessarily a pretty garden.
It is not always the same as jardim:
- quintal = yard / backyard / outdoor area of the house
- jardim = garden, or sometimes a front yard with plants
So quintal is often the better word for a backyard where people hang clothes, keep pets, plant things, or have open space.