-ir and -er ending verbs are very similar in their endings when they are conjugated. How do they differ in their endings when they are conjugated?

Although -ir and -er ending verbs have some similarities in their conjugation patterns, they differ in their endings when conjugated in certain forms. Here are some key differences:

Present tense:
-ir ending verbs in the present tense have the endings -o, -es, -e, -imos, -ís, -en. For example, "vivir" (to live) conjugated in the present tense is: vivo, vives, vive, vivimos, vivís, viven.
-er ending verbs in the present tense have the endings -o, -es, -e, -emos, -éis, -en. For example, "comer" (to eat) conjugated in the present tense is: como, comes, come, comemos, coméis, comen.

Imperfect tense:
-ir ending verbs in the imperfect tense for the "yo" form have the ending -ía. For example, "vivir" conjugated in the imperfect tense would be: vivía.
-er ending verbs in the imperfect tense for the "yo" form have the ending -ía. For example, "comer" conjugated in the imperfect tense would be: comía.

Preterite tense:
-ir ending verbs in the preterite tense for the "yo" form have the ending -í. For example, "vivir" conjugated in the preterite tense would be: viví.
-er ending verbs in the preterite tense for the "yo" form have the ending -í. For example, "comer" conjugated in the preterite tense would be: comí.

These are just a few examples of the differences in conjugation endings between -ir and -er ending verbs. It's important to note that there are various irregular verbs in both -ir and -er endings, and each verb might have specific conjugation changes.