Pease asap -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?

When you conjugate ar, ir and er verbs you remove the infinitive ending and then you add the ending that matches the subject. I think you're trying to ask how you can differentiate between ar, ir and er verbs after they are conjugated so I'll type a little example:

hablar

yo: hablo

tú: hablas

ella, el, usted: habla

nosotros: hablamos

ellos, ellas, ustedes: hablan

comer

yo: como

tú: comes

ella, el, usted: come

nosotros: comemos

ellos, ellas, ustedes: comen

vivir

yo: vivo

tú: vives

ella, el, usted: vive

nosotros: vivimos

ellos, ellas, ustedes: viven

I don't know how to explain this properly but, when you compare the three you can see the obvious differences. Like you stated, they are similar but they are also very different. (Hope this helps? Language is a very hard thing to understand immediately. Good luck!)

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hope this answers it