What is an infinitive?
An infinitive is the basic verb form.
In English, the infinitive verb is a verb form which begins with the word 'to'. For example: to speak, to eat, to live.
In Spanish, the infinitive verb is a verb form which ends with the letters -ar, -er, or -ir. For example: hablar, comer, vivir.
Singular & Plural Subjects
Generally the subject isn't necessary because the conjugated verb indicates the subject. The subject is sometimes used for emphasis.
1st person (I): yo
2nd person (you): tú/vos*
3rd person (you/he/she): usted/él/ella
1st person (us): nosotros
2nd person (you guys): ustedes
3rd person (them): ellos/ellas
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