sentences:  For example, "he has to go" where only the auxiliary verb "have" is inflected for time and the main verb "to go" is in the infinitive, or in a complement clause such as "I saw him leave", where the main verb is "to see" which is in a preterite form, and "leave" is in the infinitive.English also makes frequent use of constructions traditionally called phrasal verbs, verb phrases that are made up of a verb root and a preposition or particle which follows the verb.The phrase then functions as a single predicate.