Questions & Answers about Hi ha una porta a l'habitació.
Hi ha is the usual Catalan way to say there is or there are.
It is made of:
- ha: the he/she/it has form of haver
- hi: a little word that is part of the fixed existential expression haver-hi
So learners often treat hi ha as one chunk meaning there is / there are.
Because for existence, Catalan normally uses haver-hi, not plain haver.
So:
- Hi ha una porta = There is a door
- Ha una porta is not correct for this meaning
The hi is not optional here. In this structure, it belongs to the expression.