could prestamp
Regular verb: prestamp - prestamped- prestamped

Affirmation 	
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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	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 	
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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	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 	
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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? 	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 	
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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? 	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?