Basic Tenses structures of english

These are the forms of the main verb that we use to construct the tenses:

base verb	past	past participle	present participle -ing
work	worked	worked	working

 

Tense Structure		past	present	future
SIMPLE do + base verb (except future: will + base verb)	+	I did work I worked	I do work I work	I will work
	-	I did not work	I do not work	I will not work
	?	Did I work?	Do I work?	Will I work?
SIMPLE PERFECT have + past participle	+	I had worked	I have worked	I will have worked
	-	I had not worked	I have not worked	I will not have worked
	?	Had I worked?	Have I worked?	Will I have worked?
CONTINUOUS be + ing	+	I was working	I am working	I will be working
	-	I was not working	I am not working	I will not be working
	?	Was I working?	Am I working?	Will I be working?
CONTINUOUS PERFECT have been + ing	+	I had been working	I have been working	I will have been working
	-	I had not been working	I have not been working	I will not have been working
	?	Had I been working?	Have I been working?	Will I have been working?