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 can't refine you can't refine she 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 she can't be refining we can't be refining you can't be refining they can't be refining
Perfect	V-ing perfect
I can't have refined you can't have refined she 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 she 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
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't I refine? can't you refine? can't she 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 she be refining? can't we be refining? can't you be refining? can't they be refining?
Perfect	V-ing perfect
can't I have refined? can't you have refined? can't she 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 she have been refining? can't we have been refining? can't you have been refining? can't they have been refining?