could persist
Verbo regular: persist - persisted- persisted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could persist
you could persist
he could persist
we could persist
you could persist
they could persist 	I could be persisting
you could be persisting
he could be persisting
we could be persisting
you could be persisting
they could be persisting	I could have persisted
you could have persisted
he could have persisted
we could have persisted
you could have persisted
they could have persisted	I could have been persisting
you could have been persisting
he could have been persisting
we could have been persisting
you could have been persisting
they could have been persisting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not persist
you could not persist
he could not persist
we could not persist
you could not persist
they could not persist 	I could not be persisting
you could not be persisting
he could not be persisting
we could not be persisting
you could not be persisting
they could not be persisting	I could not have persisted
you could not have persisted
he could not have persisted
we could not have persisted
you could not have persisted
they could not have persisted	I could not have been persisting
you could not have been persisting
he could not have been persisting
we could not have been persisting
you could not have been persisting
they could not have been persisting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I persist?
could you persist?
could he persist?
could we persist?
could you persist?
could they persist? 	could I be persisting?
could you be persisting?
could he be persisting?
could we be persisting?
could you be persisting?
could they be persisting? 	could I have persisted?
could you have persisted?
could he have persisted?
could we have persisted?
could you have persisted?
could they have persisted? 	could I have been persisting?
could you have been persisting?
could he have been persisting?
could we have been persisting?
could you have been persisting?
could they have been persisting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not persist?
could you not persist?
could he not persist?
could we not persist?
could you not persist?
could they not persist? 	could I not be persisting?
could you not be persisting?
could he not be persisting?
could we not be persisting?
could you not be persisting?
could they not be persisting? 	could I not have persisted?
could you not have persisted?
could he not have persisted?
could we not have persisted?
could you not have persisted?
could they not have persisted? 	could I not have been persisting?
could you not have been persisting?
could he not have been persisting?
could we not have been persisting?
could you not have been persisting?
could they not have been persisting?