Six main patterns, and they are not exceptions

You know how to make 가다 into 가요. You learned the rule, it worked, and then one day you said 덥어요 and the room went quiet.

This week fixes that, and it has an ending — which is unusual for Korean grammar.

Every Korean verb and adjective in the dictionary ends in 다. Remove it and what is left is the stem — the part that carries the meaning and the part that sometimes changes.