8/10 (highly irregular, ergative alignment, split usage). Essential for fluency, but requires dedicated memorization.
The most common way to express "to have" (possess) in Basque is: verbo tener euskera
So using edun for all Spanish tener expressions would be wrong. The rule: Use edun only for of concrete or abstract objects (a car, a dog, an idea), not for physical sensations or age. 8/10 (highly irregular, ergative alignment, split usage)