English verb conjugation
CAN UNDERSTOCK

Regular verb: understock - understocked - understocked

Affirmation

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