could double-lock
Regular verb: double-lock - double-locked- double-locked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could double-lock
you could double-lock
she could double-lock
we could double-lock
you could double-lock
they could double-lock 	I could be double-locking
you could be double-locking
she could be double-locking
we could be double-locking
you could be double-locking
they could be double-locking	I could have double-locked
you could have double-locked
she could have double-locked
we could have double-locked
you could have double-locked
they could have double-locked	I could have been double-locking
you could have been double-locking
she could have been double-locking
we could have been double-locking
you could have been double-locking
they could have been double-locking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not double-lock
you could not double-lock
she could not double-lock
we could not double-lock
you could not double-lock
they could not double-lock 	I could not be double-locking
you could not be double-locking
she could not be double-locking
we could not be double-locking
you could not be double-locking
they could not be double-locking	I could not have double-locked
you could not have double-locked
she could not have double-locked
we could not have double-locked
you could not have double-locked
they could not have double-locked	I could not have been double-locking
you could not have been double-locking
she could not have been double-locking
we could not have been double-locking
you could not have been double-locking
they could not have been double-locking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I double-lock?
could you double-lock?
could she double-lock?
could we double-lock?
could you double-lock?
could they double-lock? 	could I be double-locking?
could you be double-locking?
could she be double-locking?
could we be double-locking?
could you be double-locking?
could they be double-locking? 	could I have double-locked?
could you have double-locked?
could she have double-locked?
could we have double-locked?
could you have double-locked?
could they have double-locked? 	could I have been double-locking?
could you have been double-locking?
could she have been double-locking?
could we have been double-locking?
could you have been double-locking?
could they have been double-locking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not double-lock?
could you not double-lock?
could she not double-lock?
could we not double-lock?
could you not double-lock?
could they not double-lock? 	could I not be double-locking?
could you not be double-locking?
could she not be double-locking?
could we not be double-locking?
could you not be double-locking?
could they not be double-locking? 	could I not have double-locked?
could you not have double-locked?
could she not have double-locked?
could we not have double-locked?
could you not have double-locked?
could they not have double-locked? 	could I not have been double-locking?
could you not have been double-locking?
could she not have been double-locking?
could we not have been double-locking?
could you not have been double-locking?
could they not have been double-locking?