The Principal Parts of Verbs. Infinitive Present Participle Past Past Participle . Infinitive. Definition: a verb form that can be used as a noun, an adjective, or an adverb. Infinitives begin with to ! Examples: No one wants to stay . To leave now would be rude.
Helping verbs is or are + the –ing form of the verb
Helping verbs have, has or had + the past form of the verb
*Irregular verbs have a separate past participle form of the verb
Al Capone shined my shoes.
Al Capone will shine my shoes.
Al Capone is shining my shoes.
Al Capone has shined my shoes.