Some verbs do not follow the pattern you have learned for regular present tense verbs, and must be memorized. For example, the yo forms of salir, tener, and venir are irregular: salgo, tengo, and vengo. In addition, for other forms of tener and venir as well as preferir and querer, when the stem vowel -e- is stressed, it becomes ie : tienes, vienes, prefieres, quieres, and so on. In the same manner, the stem vowel -o- in poder becomes ue when stressed: puedes. In vocabulary lists, these changes are listed in parentheses beside the infinitive verb: preferir (ie); poder (ue), and so on.

TENER (to have)
tengo	tenemos
tienes	tenèis
tiene	tienen

 

QUERER (to want)
quiero	queremos
quieres	querèis
quiere	quieren

 

PODER (to be able)
puedo	podemos
puedes	podèis
puede	pueden

 

VENIR (to come)
vengo	venimos
vienes	venìs
viene	vienen

 

PREFERIR (to prefer)
prefiero	preferimos
prefieres	preferìs
prefiere	prefieren

 

SALIR (to leave)
salgo	salimos
sales	salìs
sale	salen