Progressive tense or Continuous Tense consist of 4 types. First, the popular tense is

Present Continuous Tense.

This tense explains about what are you doing right now.

Ex           : I am playing Uno cards.

Past Continous Tense

Nothing different about the form of this tense with Present Continuous Tense. It just explains that you do the progress on the time before now.

Ex           : I was reading when the light turn off.

Future Continuous Tense

It explains about what progress will you do after now.

Ex           : I will be writing.

Past Future  Continuous Tense

It has similar form with FCT, but the modals are changed by V3. Like as, will=would, shall=should, may=might etc.

Ex           : I could be going crazy