I could hackle you could hackle she could hackle we could hackle you could hackle they could hackle
V-ing form
I could be hackling you could be hackling she could be hackling we could be hackling you could be hackling they could be hackling
Perfect
I could have hackled you could have hackled she could have hackled we could have hackled you could have hackled they could have hackled
V-ing perfect
I could have been hackling you could have been hackling she could have been hackling we could have been hackling you could have been hackling they could have been hackling
Negation
Simple form
I could not hackle you could not hackle she could not hackle we could not hackle you could not hackle they could not hackle
V-ing form
I could not be hackling you could not be hackling she could not be hackling we could not be hackling you could not be hackling they could not be hackling
Perfect
I could not have hackled you could not have hackled she could not have hackled we could not have hackled you could not have hackled they could not have hackled
V-ing perfect
I could not have been hackling you could not have been hackling she could not have been hackling we could not have been hackling you could not have been hackling they could not have been hackling
Interrogative form
Simple form
could I hackle? could you hackle? could she hackle? could we hackle? could you hackle? could they hackle?
V-ing form
could I be hackling? could you be hackling? could she be hackling? could we be hackling? could you be hackling? could they be hackling?
Perfect
could I have hackled? could you have hackled? could she have hackled? could we have hackled? could you have hackled? could they have hackled?
V-ing perfect
could I have been hackling? could you have been hackling? could she have been hackling? could we have been hackling? could you have been hackling? could they have been hackling?
Interro-negative form
Simple form
could I not hackle? could you not hackle? could she not hackle? could we not hackle? could you not hackle? could they not hackle?
V-ing form
could I not be hackling? could you not be hackling? could she not be hackling? could we not be hackling? could you not be hackling? could they not be hackling?
Perfect
could I not have hackled? could you not have hackled? could she not have hackled? could we not have hackled? could you not have hackled? could they not have hackled?
V-ing perfect
could I not have been hackling? could you not have been hackling? could she not have been hackling? could we not have been hackling? could you not have been hackling? could they not have been hackling?