could shackle
Regular verb: shackle - shackled- shackled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I could not shackle
you could not shackle
he could not shackle
we could not shackle
you could not shackle
they could not shackle 	I could not be shackling
you could not be shackling
he could not be shackling
we could not be shackling
you could not be shackling
they could not be shackling	I could not have shackled
you could not have shackled
he could not have shackled
we could not have shackled
you could not have shackled
they could not have shackled	I could not have been shackling
you could not have been shackling
he could not have been shackling
we could not have been shackling
you could not have been shackling
they could not have been shackling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
could I not shackle?
could you not shackle?
could he not shackle?
could we not shackle?
could you not shackle?
could they not shackle? 	could I not be shackling?
could you not be shackling?
could he not be shackling?
could we not be shackling?
could you not be shackling?
could they not be shackling? 	could I not have shackled?
could you not have shackled?
could he not have shackled?
could we not have shackled?
could you not have shackled?
could they not have shackled? 	could I not have been shackling?
could you not have been shackling?
could he not have been shackling?
could we not have been shackling?
could you not have been shackling?
could they not have been shackling?