English verb conjugation
COULD BLISTER

Regular verb: blister - blistered - blistered

Affirmation

Simple form	V-ing form
I could blister you could blister he could blister we could blister you could blister they could blister	I could be blistering you could be blistering he could be blistering we could be blistering you could be blistering they could be blistering
Perfect	V-ing perfect
I could have blistered you could have blistered he could have blistered we could have blistered you could have blistered they could have blistered	I could have been blistering you could have been blistering he could have been blistering we could have been blistering you could have been blistering they could have been blistering

Negation

Simple form	V-ing form
I couldn't blister you couldn't blister he couldn't blister we couldn't blister you couldn't blister they couldn't blister	I couldn't be blistering you couldn't be blistering he couldn't be blistering we couldn't be blistering you couldn't be blistering they couldn't be blistering
Perfect	V-ing perfect
I couldn't have blistered you couldn't have blistered he couldn't have blistered we couldn't have blistered you couldn't have blistered they couldn't have blistered	I couldn't have been blistering you couldn't have been blistering he couldn't have been blistering we couldn't have been blistering you couldn't have been blistering they couldn't have been blistering

Interrogative form

Simple form	V-ing form
could I blister? could you blister? could he blister? could we blister? could you blister? could they blister?	could I be blistering? could you be blistering? could he be blistering? could we be blistering? could you be blistering? could they be blistering?
Perfect	V-ing perfect
could I have blistered? could you have blistered? could he have blistered? could we have blistered? could you have blistered? could they have blistered?	could I have been blistering? could you have been blistering? could he have been blistering? could we have been blistering? could you have been blistering? could they have been blistering?

Interro-negative form

Simple form	V-ing form
couldn't I blister? couldn't you blister? couldn't he blister? couldn't we blister? couldn't you blister? couldn't they blister?	couldn't I be blistering? couldn't you be blistering? couldn't he be blistering? couldn't we be blistering? couldn't you be blistering? couldn't they be blistering?
Perfect	V-ing perfect
couldn't I have blistered? couldn't you have blistered? couldn't he have blistered? couldn't we have blistered? couldn't you have blistered? couldn't they have blistered?	couldn't I have been blistering? couldn't you have been blistering? couldn't he have been blistering? couldn't we have been blistering? couldn't you have been blistering? couldn't they have been blistering?