English verb conjugation
COULD UNCHAIN

Regular verb: unchain - unchained - unchained

Affirmation

Simple form	V-ing form
I could unchain you could unchain he could unchain we could unchain you could unchain they could unchain	I could be unchaining you could be unchaining he could be unchaining we could be unchaining you could be unchaining they could be unchaining
Perfect	V-ing perfect
I could have unchained you could have unchained he could have unchained we could have unchained you could have unchained they could have unchained	I could have been unchaining you could have been unchaining he could have been unchaining we could have been unchaining you could have been unchaining they could have been unchaining

Negation

Simple form	V-ing form
I couldn't unchain you couldn't unchain he couldn't unchain we couldn't unchain you couldn't unchain they couldn't unchain	I couldn't be unchaining you couldn't be unchaining he couldn't be unchaining we couldn't be unchaining you couldn't be unchaining they couldn't be unchaining
Perfect	V-ing perfect
I couldn't have unchained you couldn't have unchained he couldn't have unchained we couldn't have unchained you couldn't have unchained they couldn't have unchained	I couldn't have been unchaining you couldn't have been unchaining he couldn't have been unchaining we couldn't have been unchaining you couldn't have been unchaining they couldn't have been unchaining

Interrogative form

Simple form	V-ing form
could I unchain? could you unchain? could he unchain? could we unchain? could you unchain? could they unchain?	could I be unchaining? could you be unchaining? could he be unchaining? could we be unchaining? could you be unchaining? could they be unchaining?
Perfect	V-ing perfect
could I have unchained? could you have unchained? could he have unchained? could we have unchained? could you have unchained? could they have unchained?	could I have been unchaining? could you have been unchaining? could he have been unchaining? could we have been unchaining? could you have been unchaining? could they have been unchaining?

Interro-negative form

Simple form	V-ing form
couldn't I unchain? couldn't you unchain? couldn't he unchain? couldn't we unchain? couldn't you unchain? couldn't they unchain?	couldn't I be unchaining? couldn't you be unchaining? couldn't he be unchaining? couldn't we be unchaining? couldn't you be unchaining? couldn't they be unchaining?
Perfect	V-ing perfect
couldn't I have unchained? couldn't you have unchained? couldn't he have unchained? couldn't we have unchained? couldn't you have unchained? couldn't they have unchained?	couldn't I have been unchaining? couldn't you have been unchaining? couldn't he have been unchaining? couldn't we have been unchaining? couldn't you have been unchaining? couldn't they have been unchaining?