English verb conjugation
COULD RAREFY

Regular verb: rarefy - rarefied - rarefied

Affirmation

Simple form	V-ing form
I could rarefy you could rarefy she could rarefy we could rarefy you could rarefy they could rarefy	I could be rarefying you could be rarefying she could be rarefying we could be rarefying you could be rarefying they could be rarefying
Perfect	V-ing perfect
I could have rarefied you could have rarefied she could have rarefied we could have rarefied you could have rarefied they could have rarefied	I could have been rarefying you could have been rarefying she could have been rarefying we could have been rarefying you could have been rarefying they could have been rarefying

Negation

Simple form	V-ing form
I could not rarefy you could not rarefy she could not rarefy we could not rarefy you could not rarefy they could not rarefy	I could not be rarefying you could not be rarefying she could not be rarefying we could not be rarefying you could not be rarefying they could not be rarefying
Perfect	V-ing perfect
I could not have rarefied you could not have rarefied she could not have rarefied we could not have rarefied you could not have rarefied they could not have rarefied	I could not have been rarefying you could not have been rarefying she could not have been rarefying we could not have been rarefying you could not have been rarefying they could not have been rarefying

Interrogative form

Simple form	V-ing form
could I rarefy? could you rarefy? could she rarefy? could we rarefy? could you rarefy? could they rarefy?	could I be rarefying? could you be rarefying? could she be rarefying? could we be rarefying? could you be rarefying? could they be rarefying?
Perfect	V-ing perfect
could I have rarefied? could you have rarefied? could she have rarefied? could we have rarefied? could you have rarefied? could they have rarefied?	could I have been rarefying? could you have been rarefying? could she have been rarefying? could we have been rarefying? could you have been rarefying? could they have been rarefying?

Interro-negative form

Simple form	V-ing form
could I not rarefy? could you not rarefy? could she not rarefy? could we not rarefy? could you not rarefy? could they not rarefy?	could I not be rarefying? could you not be rarefying? could she not be rarefying? could we not be rarefying? could you not be rarefying? could they not be rarefying?
Perfect	V-ing perfect
could I not have rarefied? could you not have rarefied? could she not have rarefied? could we not have rarefied? could you not have rarefied? could they not have rarefied?	could I not have been rarefying? could you not have been rarefying? could she not have been rarefying? could we not have been rarefying? could you not have been rarefying? could they not have been rarefying?