English verb conjugation
COULD SHACKLE

Regular verb: shackle - shackled - shackled

Affirmation

Simple form	V-ing form
I could shackle you could shackle he could shackle we could shackle you could shackle they could shackle	I could be shackling you could be shackling he could be shackling we could be shackling you could be shackling they could be shackling
Perfect	V-ing perfect
I could have shackled you could have shackled he could have shackled we could have shackled you could have shackled they could have shackled	I could have been shackling you could have been shackling he could have been shackling we could have been shackling you could have been shackling they could have been shackling

Negation

Simple form	V-ing form
I couldn't shackle you couldn't shackle he couldn't shackle we couldn't shackle you couldn't shackle they couldn't shackle	I couldn't be shackling you couldn't be shackling he couldn't be shackling we couldn't be shackling you couldn't be shackling they couldn't be shackling
Perfect	V-ing perfect
I couldn't have shackled you couldn't have shackled he couldn't have shackled we couldn't have shackled you couldn't have shackled they couldn't have shackled	I couldn't have been shackling you couldn't have been shackling he couldn't have been shackling we couldn't have been shackling you couldn't have been shackling they couldn't have been shackling

Interrogative form

Simple form	V-ing form
could I shackle? could you shackle? could he shackle? could we shackle? could you shackle? could they shackle?	could I be shackling? could you be shackling? could he be shackling? could we be shackling? could you be shackling? could they be shackling?
Perfect	V-ing perfect
could I have shackled? could you have shackled? could he have shackled? could we have shackled? could you have shackled? could they have shackled?	could I have been shackling? could you have been shackling? could he have been shackling? could we have been shackling? could you have been shackling? could they have been shackling?

Interro-negative form

Simple form	V-ing form
couldn't I shackle? couldn't you shackle? couldn't he shackle? couldn't we shackle? couldn't you shackle? couldn't they shackle?	couldn't I be shackling? couldn't you be shackling? couldn't he be shackling? couldn't we be shackling? couldn't you be shackling? couldn't they be shackling?
Perfect	V-ing perfect
couldn't I have shackled? couldn't you have shackled? couldn't he have shackled? couldn't we have shackled? couldn't you have shackled? couldn't they have shackled?	couldn't I have been shackling? couldn't you have been shackling? couldn't he have been shackling? couldn't we have been shackling? couldn't you have been shackling? couldn't they have been shackling?