could lock
Verbo regular: lock - locked- locked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could lock
you could lock
she could lock
we could lock
you could lock
they could lock 	I could be locking
you could be locking
she could be locking
we could be locking
you could be locking
they could be locking	I could have locked
you could have locked
she could have locked
we could have locked
you could have locked
they could have locked	I could have been locking
you could have been locking
she could have been locking
we could have been locking
you could have been locking
they could have been locking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not lock
you could not lock
she could not lock
we could not lock
you could not lock
they could not lock 	I could not be locking
you could not be locking
she could not be locking
we could not be locking
you could not be locking
they could not be locking	I could not have locked
you could not have locked
she could not have locked
we could not have locked
you could not have locked
they could not have locked	I could not have been locking
you could not have been locking
she could not have been locking
we could not have been locking
you could not have been locking
they could not have been locking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I lock?
could you lock?
could she lock?
could we lock?
could you lock?
could they lock? 	could I be locking?
could you be locking?
could she be locking?
could we be locking?
could you be locking?
could they be locking? 	could I have locked?
could you have locked?
could she have locked?
could we have locked?
could you have locked?
could they have locked? 	could I have been locking?
could you have been locking?
could she have been locking?
could we have been locking?
could you have been locking?
could they have been locking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not lock?
could you not lock?
could she not lock?
could we not lock?
could you not lock?
could they not lock? 	could I not be locking?
could you not be locking?
could she not be locking?
could we not be locking?
could you not be locking?
could they not be locking? 	could I not have locked?
could you not have locked?
could she not have locked?
could we not have locked?
could you not have locked?
could they not have locked? 	could I not have been locking?
could you not have been locking?
could she not have been locking?
could we not have been locking?
could you not have been locking?
could they not have been locking?