can fever
Regular verb: fever - fevered- fevered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can fever
you can fever
he can fever
we can fever
you can fever
they can fever 	I can be fevering
you can be fevering
he can be fevering
we can be fevering
you can be fevering
they can be fevering	I can have fevered
you can have fevered
he can have fevered
we can have fevered
you can have fevered
they can have fevered	I can have been fevering
you can have been fevering
he can have been fevering
we can have been fevering
you can have been fevering
they can have been fevering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot fever
you cannot fever
he cannot fever
we cannot fever
you cannot fever
they cannot fever 	I cannot be fevering
you cannot be fevering
he cannot be fevering
we cannot be fevering
you cannot be fevering
they cannot be fevering	I cannot have fevered
you cannot have fevered
he cannot have fevered
we cannot have fevered
you cannot have fevered
they cannot have fevered	I cannot have been fevering
you cannot have been fevering
he cannot have been fevering
we cannot have been fevering
you cannot have been fevering
they cannot have been fevering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I fever?
can you fever?
can he fever?
can we fever?
can you fever?
can they fever? 	can I be fevering?
can you be fevering?
can he be fevering?
can we be fevering?
can you be fevering?
can they be fevering? 	can I have fevered?
can you have fevered?
can he have fevered?
can we have fevered?
can you have fevered?
can they have fevered? 	can I have been fevering?
can you have been fevering?
can he have been fevering?
can we have been fevering?
can you have been fevering?
can they have been fevering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not fever?
can you not fever?
can he not fever?
can we not fever?
can you not fever?
can they not fever? 	can I not be fevering?
can you not be fevering?
can he not be fevering?
can we not be fevering?
can you not be fevering?
can they not be fevering? 	can I not have fevered?
can you not have fevered?
can he not have fevered?
can we not have fevered?
can you not have fevered?
can they not have fevered? 	can I not have been fevering?
can you not have been fevering?
can he not have been fevering?
can we not have been fevering?
can you not have been fevering?
can they not have been fevering?