can understock
Regular verb: understock - understocked- understocked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can understock
you can understock
he can understock
we can understock
you can understock
they can understock 	I can be understocking
you can be understocking
he can be understocking
we can be understocking
you can be understocking
they can be understocking	I can have understocked
you can have understocked
he can have understocked
we can have understocked
you can have understocked
they can have understocked	I can have been understocking
you can have been understocking
he can have been understocking
we can have been understocking
you can have been understocking
they can have been understocking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't understock
you can't understock
he can't understock
we can't understock
you can't understock
they can't understock 	I can't be understocking
you can't be understocking
he can't be understocking
we can't be understocking
you can't be understocking
they can't be understocking	I can't have understocked
you can't have understocked
he can't have understocked
we can't have understocked
you can't have understocked
they can't have understocked	I can't have been understocking
you can't have been understocking
he can't have been understocking
we can't have been understocking
you can't have been understocking
they can't have been understocking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I understock?
can you understock?
can he understock?
can we understock?
can you understock?
can they understock? 	can I be understocking?
can you be understocking?
can he be understocking?
can we be understocking?
can you be understocking?
can they be understocking? 	can I have understocked?
can you have understocked?
can he have understocked?
can we have understocked?
can you have understocked?
can they have understocked? 	can I have been understocking?
can you have been understocking?
can he have been understocking?
can we have been understocking?
can you have been understocking?
can they have been understocking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I understock?
can't you understock?
can't he understock?
can't we understock?
can't you understock?
can't they understock? 	can't I be understocking?
can't you be understocking?
can't he be understocking?
can't we be understocking?
can't you be understocking?
can't they be understocking? 	can't I have understocked?
can't you have understocked?
can't he have understocked?
can't we have understocked?
can't you have understocked?
can't they have understocked? 	can't I have been understocking?
can't you have been understocking?
can't he have been understocking?
can't we have been understocking?
can't you have been understocking?
can't they have been understocking?