Songs and chants
Verb endings and especially irregular forms can be challenging. Because they are not easily learned with simple rules, you have to figure out ways to memorize them. One way is through songs or chants.
A song (Irregular preterite forms)
A song (Irregular tú commands)
A song (Negative tú commands)
A chant (Present tense forms)
A chant (Preterite endings)
A chant (Irregular tú commands)
A chant (Irregular subjunctive forms)