can lock
Verbo regular: lock - locked- locked

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

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

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

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