English verb conjugation
COULD UNKNOT

Regular verb: unknot - unknotted - unknotted

Affirmation

Simple form	V-ing form
I could unknot you could unknot he could unknot we could unknot you could unknot they could unknot	I could be unknotting you could be unknotting he could be unknotting we could be unknotting you could be unknotting they could be unknotting
Perfect	V-ing perfect
I could have unknotted you could have unknotted he could have unknotted we could have unknotted you could have unknotted they could have unknotted	I could have been unknotting you could have been unknotting he could have been unknotting we could have been unknotting you could have been unknotting they could have been unknotting

Negation

Simple form	V-ing form
I couldn't unknot you couldn't unknot he couldn't unknot we couldn't unknot you couldn't unknot they couldn't unknot	I couldn't be unknotting you couldn't be unknotting he couldn't be unknotting we couldn't be unknotting you couldn't be unknotting they couldn't be unknotting
Perfect	V-ing perfect
I couldn't have unknotted you couldn't have unknotted he couldn't have unknotted we couldn't have unknotted you couldn't have unknotted they couldn't have unknotted	I couldn't have been unknotting you couldn't have been unknotting he couldn't have been unknotting we couldn't have been unknotting you couldn't have been unknotting they couldn't have been unknotting

Interrogative form

Simple form	V-ing form
could I unknot? could you unknot? could he unknot? could we unknot? could you unknot? could they unknot?	could I be unknotting? could you be unknotting? could he be unknotting? could we be unknotting? could you be unknotting? could they be unknotting?
Perfect	V-ing perfect
could I have unknotted? could you have unknotted? could he have unknotted? could we have unknotted? could you have unknotted? could they have unknotted?	could I have been unknotting? could you have been unknotting? could he have been unknotting? could we have been unknotting? could you have been unknotting? could they have been unknotting?

Interro-negative form

Simple form	V-ing form
couldn't I unknot? couldn't you unknot? couldn't he unknot? couldn't we unknot? couldn't you unknot? couldn't they unknot?	couldn't I be unknotting? couldn't you be unknotting? couldn't he be unknotting? couldn't we be unknotting? couldn't you be unknotting? couldn't they be unknotting?
Perfect	V-ing perfect
couldn't I have unknotted? couldn't you have unknotted? couldn't he have unknotted? couldn't we have unknotted? couldn't you have unknotted? couldn't they have unknotted?	couldn't I have been unknotting? couldn't you have been unknotting? couldn't he have been unknotting? couldn't we have been unknotting? couldn't you have been unknotting? couldn't they have been unknotting?