I think I’ve charted this mess of confusingness. Can anyone confirm? This is for standard adjective conjugations, not for any exceptions that we have to memorize.
These three circumstances follow the same rules:
Attributive Indefinite (“a cool car”), Predicative Indefinite (“a car is cool”), and Predicative Definite (“the car is cool”) all use the same rules which are:
no ending for masculine and feminine singular adjectives
-t ending for neuter singular adjectives
-e ending for all plurals, regardless of gender
The outlier is Attributive Definite (“the cool car”), which takes an -e ending regardless of anything. So this is a change to the above rule for only the two instances shown in points #1 and #2 above: Instead of taking no ending, the masculine and feminine singular take an -e ending, and instead of taking a -t ending, the neuter singular takes an -e ending. We no longer have extra rules for the singular adjectives. So the rule can be summarized like this:
- -e ending for everything, regardless of gender and number