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 could not understock you could not understock he could not understock we could not understock you could not understock they could not understock	I could not be understocking you could not be understocking he could not be understocking we could not be understocking you could not be understocking they could not be understocking
Perfect	V-ing perfect
I could not have understocked you could not have understocked he could not have understocked we could not have understocked you could not have understocked they could not have understocked	I could not have been understocking you could not have been understocking he could not have been understocking we could not have been understocking you could not have been understocking they could not 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
could I not understock? could you not understock? could he not understock? could we not understock? could you not understock? could they not understock?	could I not be understocking? could you not be understocking? could he not be understocking? could we not be understocking? could you not be understocking? could they not be understocking?
Perfect	V-ing perfect
could I not have understocked? could you not have understocked? could he not have understocked? could we not have understocked? could you not have understocked? could they not have understocked?	could I not have been understocking? could you not have been understocking? could he not have been understocking? could we not have been understocking? could you not have been understocking? could they not have been understocking?