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 couldn't prestamp you couldn't prestamp he couldn't prestamp we couldn't prestamp you couldn't prestamp they couldn't prestamp	I couldn't be prestamping you couldn't be prestamping he couldn't be prestamping we couldn't be prestamping you couldn't be prestamping they couldn't be prestamping
Perfect	V-ing perfect
I couldn't have prestamped you couldn't have prestamped he couldn't have prestamped we couldn't have prestamped you couldn't have prestamped they couldn't have prestamped	I couldn't have been prestamping you couldn't have been prestamping he couldn't have been prestamping we couldn't have been prestamping you couldn't have been prestamping they couldn't 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
couldn't I prestamp? couldn't you prestamp? couldn't he prestamp? couldn't we prestamp? couldn't you prestamp? couldn't they prestamp?	couldn't I be prestamping? couldn't you be prestamping? couldn't he be prestamping? couldn't we be prestamping? couldn't you be prestamping? couldn't they be prestamping?
Perfect	V-ing perfect
couldn't I have prestamped? couldn't you have prestamped? couldn't he have prestamped? couldn't we have prestamped? couldn't you have prestamped? couldn't they have prestamped?	couldn't I have been prestamping? couldn't you have been prestamping? couldn't he have been prestamping? couldn't we have been prestamping? couldn't you have been prestamping? couldn't they have been prestamping?