IRREGULAR VERBS - the stem changes

I mentioned conjugating REGULAR VERBS, what about IRREGULAR VERBS.

What are IRREGULAR VERBS? They are verbs that change to suit the PERSONAL PRONOUN, in a sometimes unpredictable way.

BUT WAIT...THERE IS WAY TO MAKE IT PREDICTABLE!

The STEM changes in the verb, what is a STEM? it is the MIDDLE PART of the word.
For example ENTENDER (to understand). Yo ENTIENDO, Tu ENTIENDES me?

See how the middle part changes, as well as the end to match the PERSONAL PRONOUN.

The rules to follow most of the time is:

Stems with o > ue
Stems with e > ie
Stems with e > i

o > ue
INIFINITVE VERB: CONTAR (to count)
yo cuento
tu cuentas
el/ella cuenta
nosotros contamos
vosotros contáis
ellos cuentan

OTHER VERB: DORMIR (to sleep)
duermo
duermes
duerme
dormimos
dormís
duermen

(The stem changes to ie in all forms except the nosotros and vosotros.)
e > ie
INIFINITVE VERB: CERRAR (to close)
cierro
cierras
cierra
cerramos
cerráis
cierran

(The stem changes to ie in all forms except the nosotros and vosotros.)
e > i
INIFINITVE VERB: PEDIR (to ask)
pido
pides
pide
pedimos
pedís
piden

HOW TO KNOW IF A VERB IS REGULAR OR IRREGULAR?
That is the kind of thing in languages that just comes from practice and memorisation.
Personally I find that, if it sounds awkward when conjugated in a regular way, it's often irregular.

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