Tense refers to the way the time of an action can be directly indicated in a verb by changing its form (i.e. morphologically). English only has two verb tenses - present tense 'I leave.' and past tense, 'I left.'. However, we have many other ways of creating the idea of tense by using auxiliary verbs or other structures that indicate the time of an action. For example, each of the following grammatical structures suggests a future event, or a future aspect (the 'will' construction is often, but loosely, called 'the English future tense'):