English verb conjugation
CAN REFINE

Regular verb: refine - refined - refined

Affirmation

Simple form	V-ing form
I can refine you can refine she can refine we can refine you can refine they can refine	I can be refining you can be refining she can be refining we can be refining you can be refining they can be refining
Perfect	V-ing perfect
I can have refined you can have refined she 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 she 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
I cannot refine you cannot refine she cannot refine we cannot refine you cannot refine they cannot refine	I cannot be refining you cannot be refining she cannot be refining we cannot be refining you cannot be refining they cannot be refining
Perfect	V-ing perfect
I cannot have refined you cannot have refined she 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 she 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
can I refine? can you refine? can she refine? can we refine? can you refine? can they refine?	can I be refining? can you be refining? can she be refining? can we be refining? can you be refining? can they be refining?
Perfect	V-ing perfect
can I have refined? can you have refined? can she 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 she 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
can I not refine? can you not refine? can she 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 she not be refining? can we not be refining? can you not be refining? can they not be refining?
Perfect	V-ing perfect
can I not have refined? can you not have refined? can she 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 she not have been refining? can we not have been refining? can you not have been refining? can they not have been refining?