This document discusses future time expressions in English grammar. It provides examples of sentences using time clauses introduced by words like "when", "before", and "by the time". It explains that the main clause will use future verb forms like "will" or "be going to" while the time clause uses simple present. The document also shows how to form yes/no and Wh- questions using time clauses and provides exercises for students to practice identifying and using different future time expressions.