could underexercise
Regular verb: underexercise - underexercised- underexercised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could underexercise
you could underexercise
he could underexercise
we could underexercise
you could underexercise
they could underexercise 	I could be underexercising
you could be underexercising
he could be underexercising
we could be underexercising
you could be underexercising
they could be underexercising	I could have underexercised
you could have underexercised
he could have underexercised
we could have underexercised
you could have underexercised
they could have underexercised	I could have been underexercising
you could have been underexercising
he could have been underexercising
we could have been underexercising
you could have been underexercising
they could have been underexercising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not underexercise
you could not underexercise
he could not underexercise
we could not underexercise
you could not underexercise
they could not underexercise 	I could not be underexercising
you could not be underexercising
he could not be underexercising
we could not be underexercising
you could not be underexercising
they could not be underexercising	I could not have underexercised
you could not have underexercised
he could not have underexercised
we could not have underexercised
you could not have underexercised
they could not have underexercised	I could not have been underexercising
you could not have been underexercising
he could not have been underexercising
we could not have been underexercising
you could not have been underexercising
they could not have been underexercising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I underexercise?
could you underexercise?
could he underexercise?
could we underexercise?
could you underexercise?
could they underexercise? 	could I be underexercising?
could you be underexercising?
could he be underexercising?
could we be underexercising?
could you be underexercising?
could they be underexercising? 	could I have underexercised?
could you have underexercised?
could he have underexercised?
could we have underexercised?
could you have underexercised?
could they have underexercised? 	could I have been underexercising?
could you have been underexercising?
could he have been underexercising?
could we have been underexercising?
could you have been underexercising?
could they have been underexercising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not underexercise?
could you not underexercise?
could he not underexercise?
could we not underexercise?
could you not underexercise?
could they not underexercise? 	could I not be underexercising?
could you not be underexercising?
could he not be underexercising?
could we not be underexercising?
could you not be underexercising?
could they not be underexercising? 	could I not have underexercised?
could you not have underexercised?
could he not have underexercised?
could we not have underexercised?
could you not have underexercised?
could they not have underexercised? 	could I not have been underexercising?
could you not have been underexercising?
could he not have been underexercising?
could we not have been underexercising?
could you not have been underexercising?
could they not have been underexercising?