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 couldn't rarefy you couldn't rarefy she couldn't rarefy we couldn't rarefy you couldn't rarefy they couldn't rarefy	I couldn't be rarefying you couldn't be rarefying she couldn't be rarefying we couldn't be rarefying you couldn't be rarefying they couldn't be rarefying
Perfect	V-ing perfect
I couldn't have rarefied you couldn't have rarefied she couldn't have rarefied we couldn't have rarefied you couldn't have rarefied they couldn't have rarefied	I couldn't have been rarefying you couldn't have been rarefying she couldn't have been rarefying we couldn't have been rarefying you couldn't have been rarefying they couldn't 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
couldn't I rarefy? couldn't you rarefy? couldn't she rarefy? couldn't we rarefy? couldn't you rarefy? couldn't they rarefy?	couldn't I be rarefying? couldn't you be rarefying? couldn't she be rarefying? couldn't we be rarefying? couldn't you be rarefying? couldn't they be rarefying?
Perfect	V-ing perfect
couldn't I have rarefied? couldn't you have rarefied? couldn't she have rarefied? couldn't we have rarefied? couldn't you have rarefied? couldn't they have rarefied?	couldn't I have been rarefying? couldn't you have been rarefying? couldn't she have been rarefying? couldn't we have been rarefying? couldn't you have been rarefying? couldn't they have been rarefying?