<h2>Right answer: ar verbs</h2>
The infinitive is one of the non-personal forms of the verb.
In Spanish grammar the infinitive has two forms:
1) Simple Infinitive: has three possible endings: -ar, -er, -ir
2) Compound Infinitive: it is formed with the verb "haber" (to have) + the participle of the verb we want to conjugate
In this case we are talking about the first form (Simple Infinitive), especifically the <u>ar verbs</u>, because cant<u>ar</u> (to sing), bail<u>ar</u> (to dance), camin<u>ar</u> (to walk), am<u>ar</u> (to love) end in <u>ar.</u>
<u></u>