9.1 How a Stem Changes
Phew. We covered ser, estar, and ir, three messy irregular verbs, but they taught us a lot. Thankfully, not all irregular verbs are quite as irregular as those three. We can learn these next ones in big batches and find patterns. The first group we'll look at are what we call stem-changers.
In Lesson 4 we learned to find the stem of the verb by simply dropping the ending:
With stem changing verbs, the stem…changes. Bet you didn't see that one coming.
Like we established before, we can find patterns that are used in other verbs. Each of these three verbs represents a different stem-changer subgroup. Let's take a look at each of them.
9.2 Stem Change: O → UE
Let's take a closer look at each subgroup. The first is the O → UE subgroup, illustrated below with the verb recordar (to remember, recall). Notice that the stem changes only in certain forms.
If the stem has multiple vowels, the last vowel in the stem is the one that changes.
9.3 Stem Change: E → IE
The second is the E → IE subgroup, illustrated below with the verb querer (to want). Again, the stem only changes in certain forms.
9.4 Stem Change: E → I
The third and final present tense stem-changer subgroup is the E → I subgroup, illustrated below with the verb pedir (to ask for). Once again, the stem only changes in certain forms.
9.5 Common Stem-Changing Verbs
That covers stem-changing verbs in the present tense. Below are tables of frequently used verbs that follow the same patterns.
| O → UE | E → IE | E → I |
|---|---|---|
| recordar (to remember) | querer (to want) | pedir (to ask for) |
| contar (to count) | acertar (to be right) | decir (to say) |
| costar (to cost) | cerrar (to close) | elegir (to choose) |
| encontrar (to find) | empezar (to begin) | sonreír (to smile) |
| probar (to try) | pensar (to think) | vestir (to dress) |
It's a lot to keep track of! But with practice, conjugating these types of verbs will become easier and easier.
Practice Time!
Master these verb conjugations from Lesson 9