[MUSIC] In a previous lesson, you learned that when the stress falls on the stem vowel of certain irregular verbs, either the E changes to IE Or the O changes to UE. Remember the [FOREIGN] and the [FOREIGN] forms are unaffected because the root vowels in these forms never receive stress in the present tense. In this lesson, you will practice changes from E to IE and from O to UE, respectively. First with the verb [FOREIGN], to want, a very useful verb. And the ar verb [FOREIGN], to cost. So with [FOREIGN] in the first person, we have [FOREIGN]. Second person, [FOREIGN] Third person, [FOREIGN]. The [FOREIGN] form, which never has anything irregular. [FOREIGN], the [FOREIGN] form also regular. [FOREIGN]. And then finally the third person plural form which has the change. [FOREIGN] And likewise, for the verb to cost, [FOREIGN], we have [FOREIGN]. Now let's look at another group of irregular verbs. This time only ir verbs where the stress stem vowel E changes to I. For instance, the verb [FOREIGN], to ask for. It's a good example of this change. So we have the endings. [FOREIGN], regular, [FOREIGN], regular. [FOREIGN] Other ir verbs with this particular change are [FOREIGN], to repeat, [FOREIGN], to compete, [FOREIGN], to correct, and [FOREIGN], to obtain. The verb [FOREIGN], to say or to tell is included in this ir verb group. But it also inserts a hard g into the first person singular [FOREIGN] form. So for [FOREIGN] when you want to say I say, I'm telling [FOREIGN]. Here are some examples. [FOREIGN] I'm telling you, the market just fascinates me. [FOREIGN] What are you saying? [FOREIGN] They tell us that the meat section is over there. [FOREIGN] The fruit sellers will tell you the prices. Other verbs with sound changes just in the Yo form are inserting a G would be, [FOREIGN], to fall. [FOREIGN]. But then, [FOREIGN]. [FOREIGN], to bring. [FOREIGN], etc. [FOREIGN], to hear. [FOREIGN] There's a Y written between the vowels so that you can preserve two syllables, given that the infinitive is [FOREIGN], two syllables. There are also some verbs that insert a Z into the yo form. So [FOREIGN], which means to produce is in the yo form. [FOREIGN] but then later, [FOREIGN], to drive, [FOREIGN]. [FOREIGN], to translate. [FOREIGN] Finally, two really frequent and useful irregular verbs are [FOREIGN], to go, and [FOREIGN], to give. Notice that the first person form, [FOREIGN], adds a y at the end. So with the verb [FOREIGN], to go, it's [FOREIGN]. [FOREIGN] And with, [FOREIGN], to give, it's [FOREIGN]. Here are some examples. [FOREIGN] I go to the market with my friends. [FOREIGN] I'll give you 15 pesos for one melon. As you might suspect, these irregular verbs are the most frequent verbs used in Spanish, so you have to practice them and get down these irregular forms.