can persevere
Regular verb: persevere - persevered- persevered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can persevere
you can persevere
she can persevere
we can persevere
you can persevere
they can persevere 	I can be persevering
you can be persevering
she can be persevering
we can be persevering
you can be persevering
they can be persevering	I can have persevered
you can have persevered
she can have persevered
we can have persevered
you can have persevered
they can have persevered	I can have been persevering
you can have been persevering
she can have been persevering
we can have been persevering
you can have been persevering
they can have been persevering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot persevere
you cannot persevere
she cannot persevere
we cannot persevere
you cannot persevere
they cannot persevere 	I cannot be persevering
you cannot be persevering
she cannot be persevering
we cannot be persevering
you cannot be persevering
they cannot be persevering	I cannot have persevered
you cannot have persevered
she cannot have persevered
we cannot have persevered
you cannot have persevered
they cannot have persevered	I cannot have been persevering
you cannot have been persevering
she cannot have been persevering
we cannot have been persevering
you cannot have been persevering
they cannot have been persevering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I persevere?
can you persevere?
can she persevere?
can we persevere?
can you persevere?
can they persevere? 	can I be persevering?
can you be persevering?
can she be persevering?
can we be persevering?
can you be persevering?
can they be persevering? 	can I have persevered?
can you have persevered?
can she have persevered?
can we have persevered?
can you have persevered?
can they have persevered? 	can I have been persevering?
can you have been persevering?
can she have been persevering?
can we have been persevering?
can you have been persevering?
can they have been persevering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not persevere?
can you not persevere?
can she not persevere?
can we not persevere?
can you not persevere?
can they not persevere? 	can I not be persevering?
can you not be persevering?
can she not be persevering?
can we not be persevering?
can you not be persevering?
can they not be persevering? 	can I not have persevered?
can you not have persevered?
can she not have persevered?
can we not have persevered?
can you not have persevered?
can they not have persevered? 	can I not have been persevering?
can you not have been persevering?
can she not have been persevering?
can we not have been persevering?
can you not have been persevering?
can they not have been persevering?