can refine
Regular verb: refine - refined- refined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can refine
you can refine
he can refine
we can refine
you can refine
they can refine 	I can be refining
you can be refining
he can be refining
we can be refining
you can be refining
they can be refining	I can have refined
you can have refined
he can have refined
we can have refined
you can have refined
they can have refined	I can have been refining
you can have been refining
he can have been refining
we can have been refining
you can have been refining
they can have been refining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't refine
you can't refine
he can't refine
we can't refine
you can't refine
they can't refine 	I can't be refining
you can't be refining
he can't be refining
we can't be refining
you can't be refining
they can't be refining	I can't have refined
you can't have refined
he can't have refined
we can't have refined
you can't have refined
they can't have refined	I can't have been refining
you can't have been refining
he can't have been refining
we can't have been refining
you can't have been refining
they can't have been refining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I refine?
can you refine?
can he refine?
can we refine?
can you refine?
can they refine? 	can I be refining?
can you be refining?
can he be refining?
can we be refining?
can you be refining?
can they be refining? 	can I have refined?
can you have refined?
can he have refined?
can we have refined?
can you have refined?
can they have refined? 	can I have been refining?
can you have been refining?
can he have been refining?
can we have been refining?
can you have been refining?
can they have been refining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I refine?
can't you refine?
can't he refine?
can't we refine?
can't you refine?
can't they refine? 	can't I be refining?
can't you be refining?
can't he be refining?
can't we be refining?
can't you be refining?
can't they be refining? 	can't I have refined?
can't you have refined?
can't he have refined?
can't we have refined?
can't you have refined?
can't they have refined? 	can't I have been refining?
can't you have been refining?
can't he have been refining?
can't we have been refining?
can't you have been refining?
can't they have been refining?