English verb conjugation
COULD UNDERSTOCK

Regular verb: understock - understocked - understocked

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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