The forms a verb takes in each aspect depend on the subject and on whether the verb is regular or irregular. There are three main tenses in English:Įach tense has a simple, progressive, perfect, and perfect progressive aspect with its own rules for conjugation. Verbs are also conjugated based on tense. Similarly, if the subject is plural, the verb must be plural. If the subject is singular, the verb must also be singular. There are six subject forms in English: I Verbs can change form depending on subject, tense, mood, and voice.
