could undervalue
Regular verb: undervalue - undervalued- undervalued

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could undervalue
you could undervalue
she could undervalue
we could undervalue
you could undervalue
they could undervalue 	I could be undervaluing
you could be undervaluing
she could be undervaluing
we could be undervaluing
you could be undervaluing
they could be undervaluing	I could have undervalued
you could have undervalued
she could have undervalued
we could have undervalued
you could have undervalued
they could have undervalued	I could have been undervaluing
you could have been undervaluing
she could have been undervaluing
we could have been undervaluing
you could have been undervaluing
they could have been undervaluing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't undervalue
you couldn't undervalue
she couldn't undervalue
we couldn't undervalue
you couldn't undervalue
they couldn't undervalue 	I couldn't be undervaluing
you couldn't be undervaluing
she couldn't be undervaluing
we couldn't be undervaluing
you couldn't be undervaluing
they couldn't be undervaluing	I couldn't have undervalued
you couldn't have undervalued
she couldn't have undervalued
we couldn't have undervalued
you couldn't have undervalued
they couldn't have undervalued	I couldn't have been undervaluing
you couldn't have been undervaluing
she couldn't have been undervaluing
we couldn't have been undervaluing
you couldn't have been undervaluing
they couldn't have been undervaluing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I undervalue?
could you undervalue?
could she undervalue?
could we undervalue?
could you undervalue?
could they undervalue? 	could I be undervaluing?
could you be undervaluing?
could she be undervaluing?
could we be undervaluing?
could you be undervaluing?
could they be undervaluing? 	could I have undervalued?
could you have undervalued?
could she have undervalued?
could we have undervalued?
could you have undervalued?
could they have undervalued? 	could I have been undervaluing?
could you have been undervaluing?
could she have been undervaluing?
could we have been undervaluing?
could you have been undervaluing?
could they have been undervaluing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I undervalue?
couldn't you undervalue?
couldn't she undervalue?
couldn't we undervalue?
couldn't you undervalue?
couldn't they undervalue? 	couldn't I be undervaluing?
couldn't you be undervaluing?
couldn't she be undervaluing?
couldn't we be undervaluing?
couldn't you be undervaluing?
couldn't they be undervaluing? 	couldn't I have undervalued?
couldn't you have undervalued?
couldn't she have undervalued?
couldn't we have undervalued?
couldn't you have undervalued?
couldn't they have undervalued? 	couldn't I have been undervaluing?
couldn't you have been undervaluing?
couldn't she have been undervaluing?
couldn't we have been undervaluing?
couldn't you have been undervaluing?
couldn't they have been undervaluing?