Tenses indicate the time something happened, is happening, or will happen through verb forms that specify the span of action. Tense uses verb forms to show the time of an action, whether in the past, present, or future. It is a grammatical category that specifies time reference through inflectional endings or auxiliary verbs.

1. Tenses
English Grammar

2. Tense is the form of a Verb that indicates the time
something happened, something happening or
something is going to happen. It is a form taken
by a verb to specify the span of action. Tense is a
verb-based method used to indicate the time of
an action.