Compare the English vs. the Spanish infinitive verbs.

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The English infinitive verbs follow the same pattern: TO + VERB,      for instance: to speak, to eat, to live...

The Spanish infinitive verbs, on the other hand, follow into 3 categories. They can either end in AR, ER, or IR.   

For example: hablar - to speak, comer - to understand, vivir - to live.