Don't you just love irregular verbs? I still remember my elementary school teachers making us chant them for hours upon hours upon hours...and yes, even native speakers have to learn them. I probably don't like the word "memorize" because of those horrible teachers that made me chant these verbs as a child, so you won't hear me saying in your lessons that you have to memorize these evil words, but when in doubt, refer to this super comprehensive list!
Complete list of IRR verbs
Download PDF • 182KB