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 couldn't underexercise
you couldn't underexercise
he couldn't underexercise
we couldn't underexercise
you couldn't underexercise
they couldn't underexercise 	I couldn't be underexercising
you couldn't be underexercising
he couldn't be underexercising
we couldn't be underexercising
you couldn't be underexercising
they couldn't be underexercising	I couldn't have underexercised
you couldn't have underexercised
he couldn't have underexercised
we couldn't have underexercised
you couldn't have underexercised
they couldn't have underexercised	I couldn't have been underexercising
you couldn't have been underexercising
he couldn't have been underexercising
we couldn't have been underexercising
you couldn't have been underexercising
they couldn't 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 	
couldn't I underexercise?
couldn't you underexercise?
couldn't he underexercise?
couldn't we underexercise?
couldn't you underexercise?
couldn't they underexercise? 	couldn't I be underexercising?
couldn't you be underexercising?
couldn't he be underexercising?
couldn't we be underexercising?
couldn't you be underexercising?
couldn't they be underexercising? 	couldn't I have underexercised?
couldn't you have underexercised?
couldn't he have underexercised?
couldn't we have underexercised?
couldn't you have underexercised?
couldn't they have underexercised? 	couldn't I have been underexercising?
couldn't you have been underexercising?
couldn't he have been underexercising?
couldn't we have been underexercising?
couldn't you have been underexercising?
couldn't they have been underexercising?