can lock
Verbo regular: lock - locked- locked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can lock
you can lock
he can lock
we can lock
you can lock
they can lock 	I can be locking
you can be locking
he can be locking
we can be locking
you can be locking
they can be locking	I can have locked
you can have locked
he 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
he can have been locking
we can have been locking
you can have been locking
they can have been locking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot lock
you cannot lock
he cannot lock
we cannot lock
you cannot lock
they cannot lock 	I cannot be locking
you cannot be locking
he cannot be locking
we cannot be locking
you cannot be locking
they cannot be locking	I cannot have locked
you cannot have locked
he 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
he cannot have been locking
we cannot have been locking
you cannot have been locking
they cannot have been locking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I lock?
can you lock?
can he lock?
can we lock?
can you lock?
can they lock? 	can I be locking?
can you be locking?
can he be locking?
can we be locking?
can you be locking?
can they be locking? 	can I have locked?
can you have locked?
can he 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 he have been locking?
can we have been locking?
can you have been locking?
can they have been locking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not lock?
can you not lock?
can he 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 he 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 he 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 he not have been locking?
can we not have been locking?
can you not have been locking?
can they not have been locking?