Hola. Finally there is a video (although a little long) to explain those strange stem-changers in the preterite. Although you might remember that -ar and -er verbs in the preterite don’t stem-change like they do in the present, the -ir verbs have to be weird. This video will explain how (e-ie) and (e-i) -ir verbs work in the preterite. Enjoy!

Notice that servir is actually an (e-i) verb in the present. This was a mistake in the video!

Let me know if you have any questions, comments or suggestions about this video below!

(e-ie)
preferir – to prefer
divertirse – to have fun
consentir – to consent
mentir – to lie
sentir – to feel (+ noun)
sentirse – to feel (+ adj)

(e-i)
pedir – to ask (for)
despedirse – to say goodbye
reír(se) – to laugh
repetir – to repeat
seguir – to continue
conseguir – to obtain, get
servir – to serve
vestirse – to dress oneself / to get dressed

Vocabulario:
la clase de español – Spanish class
comer – to eat
los tomates – tomatoes
mucho – much, a lot
en – in
las fiestas – parties
la piscina – pool
les – to them, to you all / for them, for you all
su(s) – his/her/their/your(formal)/your (plural)
la atención – attention
diez – ten
los dólares – dollars
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Related video(s):

1. Preterite regular -AR verbs
2. Preterite -AR verbs: -GAR, -CAR, -ZAR
3. Preterite regular -ER verbs
4. Preterite regular -IR verbs
5. Preterite -IR Stem-changers (o-u)