... understand the meaning Essential to know formation of verb tenses in English, but some specific situations (eg, verbals that follow verbs) don’t follow rules Gerunds and Infinitives Use an ... meeting, and I am sorry about this fact.) It was thoughtful of you to have done that. (You already did something thoughtful, and the speaker is acknowledging it now.) Gerunds and Infinitives ... Karen’s argument, she changed her way of ____ at the problem. (to look) Verb-form Error An error in the formation of the main verb or any part of a verb phrase Can significantly affect reader’s...