When conjugating verbs, some verbs change not only the ending but also the stem. There are 3 types of stem-change verbs: o--ue, e--ie, e--i
dormir = to sleep (it is an "-ir" verb, but also the "o" in the stem changes to "ue")
querer = to want (it is an "-er" verb, but also the "e" in the stem changes to "ie")
pedir = to ask for (it is an "-ir" verb, but also the "e" in the stem changes to "i")
Now you need to know 2 things when you conjugate these verbs:
1. endings (-ar, -er, -ir)
2. stem changes (o--ue, e--ie, e--i)
Let's try to conjugate verbs than change from e to ie:
comenzar (to begin), divertirse (to enjoy oneself; to have fun), empezar (to begin), entender (to understand), perder (to lose), preferir (to prefer), querer (to want), tener (to have) (tener is also irregular in the "yo" form - yo tengo)
entender = to understand (-er endings and e--ie)
Yo entiendo (I understand) Nosotros entendemos (we understand) (no change "ie" in nosotros)
Tu entiendes (you understand)
usted entiende (you understand) ustedes entienden (you guys understand)
el entiende (he understands) ellos entienden (they understand)
ella entiende (she understands)
Now it is your turn:
Conjugate "querer= to want" (-er endings and e--ie)
Yo__________ Nosotros __________
Tu_________
usted___________ Ustedes ____________
el ___________ ellos ____________
ella _____________