can lock
Regular verb: lock - locked- locked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't lock
you can't lock
she can't lock
we can't lock
you can't lock
they can't lock 	I can't be locking
you can't be locking
she can't be locking
we can't be locking
you can't be locking
they can't be locking	I can't have locked
you can't have locked
she can't have locked
we can't have locked
you can't have locked
they can't have locked	I can't have been locking
you can't have been locking
she can't have been locking
we can't have been locking
you can't have been locking
they can't have been locking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I lock?
can't you lock?
can't she lock?
can't we lock?
can't you lock?
can't they lock? 	can't I be locking?
can't you be locking?
can't she be locking?
can't we be locking?
can't you be locking?
can't they be locking? 	can't I have locked?
can't you have locked?
can't she have locked?
can't we have locked?
can't you have locked?
can't they have locked? 	can't I have been locking?
can't you have been locking?
can't she have been locking?
can't we have been locking?
can't you have been locking?
can't they have been locking?