Verbal forms are variations of verbs that express different aspects of action, such as time, mood, and voice. The main types of verbal forms include the infinitive, gerund, and participle. Each form serves a unique function in a sentence, helping to convey the intended meaning more clearly. The infinitive is the base form of a verb, often preceded by "to," while the gerund ends in "-ing" and functions as a noun. The participle can be present or past, used to create verb tenses or as adjectives. Understanding these forms is essential for effective communication in English.