i want a good defination on tense
Any of the forms of a verb which distinguish when an action or state of being occurs or exists. The basic tenses in English are present, past and future. English also has perfect tenses (present tense, present perfect, past tense, past perfect and future tense, future perfect) and progressive tenses.
In grammar, an inflected form of a verb indicating the time of a narrated event in relation to the time at which the narrator is speaking.
Time is often perceived as a continuum with three main divisions, past, present, and future, defined in relation to the time when the event is described. Other categories, including mood and aspect, may further specify the action as definite or indefinite, completed or not completed, lasting or nonlasting, and recurring or occurring once.