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 cannot refine
you cannot refine
he cannot refine
we cannot refine
you cannot refine
they cannot refine 	I cannot be refining
you cannot be refining
he cannot be refining
we cannot be refining
you cannot be refining
they cannot be refining	I cannot have refined
you cannot have refined
he cannot have refined
we cannot have refined
you cannot have refined
they cannot have refined	I cannot have been refining
you cannot have been refining
he cannot have been refining
we cannot have been refining
you cannot have been refining
they cannot 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 I not refine?
can you not refine?
can he not refine?
can we not refine?
can you not refine?
can they not refine? 	can I not be refining?
can you not be refining?
can he not be refining?
can we not be refining?
can you not be refining?
can they not be refining? 	can I not have refined?
can you not have refined?
can he not have refined?
can we not have refined?
can you not have refined?
can they not have refined? 	can I not have been refining?
can you not have been refining?
can he not have been refining?
can we not have been refining?
can you not have been refining?
can they not have been refining?