Decide si se usan los verbos correctamente. cuando yo era joven yo tocaba el piano y me gustó.

The verbs, 'played', and 'liked', are used correctly in the past tense. An example of a sentence that uses verbs incorrectly, would be: Cuando era joven, toco el piano, y me gusta. (When I was young, I play the piano, and I like it.).
Hope this helps!:)

So are you supposed to find out what it means in english?