*tense -a grammaticalcategory of verbsused to expressdistinctions of time
*present progressive, present progressive tense -a tenseused to expressactionthat is on-going at thetime of utterance
*past progressive, past progressive tense -a progressivetenseused to describeon-goingaction in thepast;"`Ihadbeenrunning' is an example of thepastprogressive"
*future progressive, future progressive tense -a progressivetenseused to expressactionthatwill be on-going in thefuture;"`Iwill be running' is an example of thefutureprogressive".
