An English teacher spent a lot of time marking grammatical errors on her students’ papers 
and was beginning to doubt whether she was getting through to them. One day as the stress got to her, she leaned over her desk and rubbed her temples.”What’s the matter, Mrs. D?” a passing student asked.
“Tense,” she mumbled.
The student hesitated a moment, then said, “What could be the matter? What has been the matter? What was the matter?”
Tense (adj) = feeling worried, uncomfortable, and unable to relax
Tense (noun) =any of the forms of a verb that show the time, continuance, or completion of an action or state that is expressed by the verb. ‘I am’ is in the present tense, ‘I was’ is past tense, and ‘I will be’ is future tense
