could underachieve
Verbo regular: underachieve - underachieved- underachieved

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could underachieve
you could underachieve
she could underachieve
we could underachieve
you could underachieve
they could underachieve 	I could be underachieving
you could be underachieving
she could be underachieving
we could be underachieving
you could be underachieving
they could be underachieving	I could have underachieved
you could have underachieved
she could have underachieved
we could have underachieved
you could have underachieved
they could have underachieved	I could have been underachieving
you could have been underachieving
she could have been underachieving
we could have been underachieving
you could have been underachieving
they could have been underachieving	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not underachieve
you could not underachieve
she could not underachieve
we could not underachieve
you could not underachieve
they could not underachieve 	I could not be underachieving
you could not be underachieving
she could not be underachieving
we could not be underachieving
you could not be underachieving
they could not be underachieving	I could not have underachieved
you could not have underachieved
she could not have underachieved
we could not have underachieved
you could not have underachieved
they could not have underachieved	I could not have been underachieving
you could not have been underachieving
she could not have been underachieving
we could not have been underachieving
you could not have been underachieving
they could not have been underachieving	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I underachieve?
could you underachieve?
could she underachieve?
could we underachieve?
could you underachieve?
could they underachieve? 	could I be underachieving?
could you be underachieving?
could she be underachieving?
could we be underachieving?
could you be underachieving?
could they be underachieving? 	could I have underachieved?
could you have underachieved?
could she have underachieved?
could we have underachieved?
could you have underachieved?
could they have underachieved? 	could I have been underachieving?
could you have been underachieving?
could she have been underachieving?
could we have been underachieving?
could you have been underachieving?
could they have been underachieving? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not underachieve?
could you not underachieve?
could she not underachieve?
could we not underachieve?
could you not underachieve?
could they not underachieve? 	could I not be underachieving?
could you not be underachieving?
could she not be underachieving?
could we not be underachieving?
could you not be underachieving?
could they not be underachieving? 	could I not have underachieved?
could you not have underachieved?
could she not have underachieved?
could we not have underachieved?
could you not have underachieved?
could they not have underachieved? 	could I not have been underachieving?
could you not have been underachieving?
could she not have been underachieving?
could we not have been underachieving?
could you not have been underachieving?
could they not have been underachieving?