English verb conjugation
COULD STAMMER

Regular verb: stammer - stammered - stammered

Affirmation

Simple form	V-ing form
I could stammer you could stammer he could stammer we could stammer you could stammer they could stammer	I could be stammering you could be stammering he could be stammering we could be stammering you could be stammering they could be stammering
Perfect	V-ing perfect
I could have stammered you could have stammered he could have stammered we could have stammered you could have stammered they could have stammered	I could have been stammering you could have been stammering he could have been stammering we could have been stammering you could have been stammering they could have been stammering

Negation

Simple form	V-ing form
I couldn't stammer you couldn't stammer he couldn't stammer we couldn't stammer you couldn't stammer they couldn't stammer	I couldn't be stammering you couldn't be stammering he couldn't be stammering we couldn't be stammering you couldn't be stammering they couldn't be stammering
Perfect	V-ing perfect
I couldn't have stammered you couldn't have stammered he couldn't have stammered we couldn't have stammered you couldn't have stammered they couldn't have stammered	I couldn't have been stammering you couldn't have been stammering he couldn't have been stammering we couldn't have been stammering you couldn't have been stammering they couldn't have been stammering

Interrogative form

Simple form	V-ing form
could I stammer? could you stammer? could he stammer? could we stammer? could you stammer? could they stammer?	could I be stammering? could you be stammering? could he be stammering? could we be stammering? could you be stammering? could they be stammering?
Perfect	V-ing perfect
could I have stammered? could you have stammered? could he have stammered? could we have stammered? could you have stammered? could they have stammered?	could I have been stammering? could you have been stammering? could he have been stammering? could we have been stammering? could you have been stammering? could they have been stammering?

Interro-negative form

Simple form	V-ing form
couldn't I stammer? couldn't you stammer? couldn't he stammer? couldn't we stammer? couldn't you stammer? couldn't they stammer?	couldn't I be stammering? couldn't you be stammering? couldn't he be stammering? couldn't we be stammering? couldn't you be stammering? couldn't they be stammering?
Perfect	V-ing perfect
couldn't I have stammered? couldn't you have stammered? couldn't he have stammered? couldn't we have stammered? couldn't you have stammered? couldn't they have stammered?	couldn't I have been stammering? couldn't you have been stammering? couldn't he have been stammering? couldn't we have been stammering? couldn't you have been stammering? couldn't they have been stammering?