This document discusses different types of clauses in English grammar. It explains that finite clauses contain tensed verbs that agree with the subject, while non-finite clauses use untensed verbs. Some specific types of non-finite clauses mentioned include preposition + -ing verb clauses, infinitive clauses as objects or in subject position, free participle clauses, -ing clauses in subject position, gerund clauses, and verb + infinitive clauses. The document provides examples for each type of clause.