This document discusses time clauses and conditionals. It defines time clauses as adverb clauses beginning with time words that describe when something occurs. It also explains the first conditional, which uses "if" with the present tense to describe possible real events, and the second conditional, which uses "if" with the past tense to describe hypothetical or imaginary events. Examples are provided for both types of conditionals. The document concludes with a brief grammar review of these structures.