could fag
Regular verb: fag - fagged- fagged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could fag
you could fag
he could fag
we could fag
you could fag
they could fag 	I could be fagging
you could be fagging
he could be fagging
we could be fagging
you could be fagging
they could be fagging	I could have fagged
you could have fagged
he could have fagged
we could have fagged
you could have fagged
they could have fagged	I could have been fagging
you could have been fagging
he could have been fagging
we could have been fagging
you could have been fagging
they could have been fagging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not fag
you could not fag
he could not fag
we could not fag
you could not fag
they could not fag 	I could not be fagging
you could not be fagging
he could not be fagging
we could not be fagging
you could not be fagging
they could not be fagging	I could not have fagged
you could not have fagged
he could not have fagged
we could not have fagged
you could not have fagged
they could not have fagged	I could not have been fagging
you could not have been fagging
he could not have been fagging
we could not have been fagging
you could not have been fagging
they could not have been fagging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I fag?
could you fag?
could he fag?
could we fag?
could you fag?
could they fag? 	could I be fagging?
could you be fagging?
could he be fagging?
could we be fagging?
could you be fagging?
could they be fagging? 	could I have fagged?
could you have fagged?
could he have fagged?
could we have fagged?
could you have fagged?
could they have fagged? 	could I have been fagging?
could you have been fagging?
could he have been fagging?
could we have been fagging?
could you have been fagging?
could they have been fagging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not fag?
could you not fag?
could he not fag?
could we not fag?
could you not fag?
could they not fag? 	could I not be fagging?
could you not be fagging?
could he not be fagging?
could we not be fagging?
could you not be fagging?
could they not be fagging? 	could I not have fagged?
could you not have fagged?
could he not have fagged?
could we not have fagged?
could you not have fagged?
could they not have fagged? 	could I not have been fagging?
could you not have been fagging?
could he not have been fagging?
could we not have been fagging?
could you not have been fagging?
could they not have been fagging?