English Grammar Drills - Mark Lester 2009

Infinitive
8 Basic Verb Forms
Part 2 Verb Phrases

The infinitive is completely regular (even for the verb be). The infinitive consists of to followed by the base form of the verb. Here are some examples:

Base form   Infinitive

be    to be

do    to do

go    to go

have    to have

sing    to sing

talk    to talk