"Blēnon rōvon issa."

Translation: The mountain is big.

[lilou612227]

I dont get it
When do i use rōvi, rōva or rōvon ??

[tim981145]

Adjectives have, like nouns, different forms for gender, number and case. So for nominative singular it would be:
- Lunar: rōva
- Solar: rōvys
- Terrestrial: rōvon
- Aquatic: rōvor
Here is a link about the HV adjectives. There is everything you need to know.
https://wiki.dothraki.org/High_Valyrian_Adjectives