When conjugating -ER and -IR verbs whose stems end in a vowel, note the spelling change in the third person singular (-ió) and plural (–ieron) of the verb. The letter from the -ió and the ending changes into the letter i y. –ieron The letter i on all the other forms of the verb receives an accent. This change occurs because any time there is an unaccented letter between two vowels, i the changes to a i y. Creer to believe – creí creímos creíste creísteis creyó creyeron caer – to fall caí caímos caíste caísteis cayó cayeron The -IR verb, follows this same pattern. oír, Oír to hear – oí oímos oíste oísteis oyó oyeron -IR ending in -iur have a similar spelling change involving the letter y for the same reason. These spelling changes only occur in the 3rd person singular and plural forms of the verb. This does not include ending in (like seguir). –guir incluir – to include incluí incluimos incluiste incluisteis incluyó incluyeron construir to construct – construí construimos construiste construisteis construyó construyeron
When conjugating -ER and -IR verbs whose stems end in a vowel, note the spelling change in the third person singular (-ió) and plural (–ieron) of the verb. The letter i from the -ió and the –ieron ending changes into the letter y. The letter i on all the other forms of the verb receives an accent. This change occurs because any time there is an unaccented letter i between two vowels, the i changes to a y. Creer – to believe creí creíste creyó creímos creísteis creyeron caer – to fall caí caíste cayó caímos caísteis cayeron The -IR verb, oír, follows this same pattern. Oír – to hear oí oíste oyó oímos oísteis oyeron -IR ending in -iur have a similar spelling change involving the letter y for the same reason. These spelling changes only occur in the 3rd person singular and plural forms of the verb. This does not include ending in –guir (like seguir). incluir – to include incluí incluiste incluyó incluimos incluisteis incluyeron construir – to construct construí construiste construyó construimos construisteis construyeron
Stem-Changing-Verbs-Compilation.docx