English verb conjugation
COULD PRESTAMP

Regular verb: prestamp - prestamped - prestamped

Affirmation

Simple form	V-ing form
I could prestamp you could prestamp he could prestamp we could prestamp you could prestamp they could prestamp	I could be prestamping you could be prestamping he could be prestamping we could be prestamping you could be prestamping they could be prestamping
Perfect	V-ing perfect
I could have prestamped you could have prestamped he could have prestamped we could have prestamped you could have prestamped they could have prestamped	I could have been prestamping you could have been prestamping he could have been prestamping we could have been prestamping you could have been prestamping they could have been prestamping

Negation

Simple form	V-ing form
I could not prestamp you could not prestamp he could not prestamp we could not prestamp you could not prestamp they could not prestamp	I could not be prestamping you could not be prestamping he could not be prestamping we could not be prestamping you could not be prestamping they could not be prestamping
Perfect	V-ing perfect
I could not have prestamped you could not have prestamped he could not have prestamped we could not have prestamped you could not have prestamped they could not have prestamped	I could not have been prestamping you could not have been prestamping he could not have been prestamping we could not have been prestamping you could not have been prestamping they could not have been prestamping

Interrogative form

Simple form	V-ing form
could I prestamp? could you prestamp? could he prestamp? could we prestamp? could you prestamp? could they prestamp?	could I be prestamping? could you be prestamping? could he be prestamping? could we be prestamping? could you be prestamping? could they be prestamping?
Perfect	V-ing perfect
could I have prestamped? could you have prestamped? could he have prestamped? could we have prestamped? could you have prestamped? could they have prestamped?	could I have been prestamping? could you have been prestamping? could he have been prestamping? could we have been prestamping? could you have been prestamping? could they have been prestamping?

Interro-negative form

Simple form	V-ing form
could I not prestamp? could you not prestamp? could he not prestamp? could we not prestamp? could you not prestamp? could they not prestamp?	could I not be prestamping? could you not be prestamping? could he not be prestamping? could we not be prestamping? could you not be prestamping? could they not be prestamping?
Perfect	V-ing perfect
could I not have prestamped? could you not have prestamped? could he not have prestamped? could we not have prestamped? could you not have prestamped? could they not have prestamped?	could I not have been prestamping? could you not have been prestamping? could he not have been prestamping? could we not have been prestamping? could you not have been prestamping? could they not have been prestamping?