I can refine you can refine she can refine we can refine you can refine they can refine
Forma con V-ing
I can be refining you can be refining she can be refining we can be refining you can be refining they can be refining
Perfecto
I can have refined you can have refined she can have refined we can have refined you can have refined they can have refined
Perfecto con V-ing
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
Negación
Forma simple
I can't refine you can't refine she can't refine we can't refine you can't refine they can't refine
Forma con V-ing
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
Perfecto
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
Perfecto con V-ing
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
Forma interrogativa
Forma simple
can I refine? can you refine? can she refine? can we refine? can you refine? can they refine?
Forma con V-ing
can I be refining? can you be refining? can she be refining? can we be refining? can you be refining? can they be refining?
Perfecto
can I have refined? can you have refined? can she have refined? can we have refined? can you have refined? can they have refined?
Perfecto con V-ing
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?
Forma interro-negativa
Forma simple
can't I refine? can't you refine? can't she refine? can't we refine? can't you refine? can't they refine?
Forma con V-ing
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?
Perfecto
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?
Perfecto con V-ing
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?