could rubberstamp
Regular verb: rubberstamp - rubberstamped- rubberstamped

Affirmation 	
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I could rubberstamp
you could rubberstamp
he could rubberstamp
we could rubberstamp
you could rubberstamp
they could rubberstamp 	I could be rubberstamping
you could be rubberstamping
he could be rubberstamping
we could be rubberstamping
you could be rubberstamping
they could be rubberstamping	I could have rubberstamped
you could have rubberstamped
he could have rubberstamped
we could have rubberstamped
you could have rubberstamped
they could have rubberstamped	I could have been rubberstamping
you could have been rubberstamping
he could have been rubberstamping
we could have been rubberstamping
you could have been rubberstamping
they could have been rubberstamping	

Negation 	
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I couldn't rubberstamp
you couldn't rubberstamp
he couldn't rubberstamp
we couldn't rubberstamp
you couldn't rubberstamp
they couldn't rubberstamp 	I couldn't be rubberstamping
you couldn't be rubberstamping
he couldn't be rubberstamping
we couldn't be rubberstamping
you couldn't be rubberstamping
they couldn't be rubberstamping	I couldn't have rubberstamped
you couldn't have rubberstamped
he couldn't have rubberstamped
we couldn't have rubberstamped
you couldn't have rubberstamped
they couldn't have rubberstamped	I couldn't have been rubberstamping
you couldn't have been rubberstamping
he couldn't have been rubberstamping
we couldn't have been rubberstamping
you couldn't have been rubberstamping
they couldn't have been rubberstamping	

Interrogative form 	
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could I rubberstamp?
could you rubberstamp?
could he rubberstamp?
could we rubberstamp?
could you rubberstamp?
could they rubberstamp? 	could I be rubberstamping?
could you be rubberstamping?
could he be rubberstamping?
could we be rubberstamping?
could you be rubberstamping?
could they be rubberstamping? 	could I have rubberstamped?
could you have rubberstamped?
could he have rubberstamped?
could we have rubberstamped?
could you have rubberstamped?
could they have rubberstamped? 	could I have been rubberstamping?
could you have been rubberstamping?
could he have been rubberstamping?
could we have been rubberstamping?
could you have been rubberstamping?
could they have been rubberstamping? 	

Interro-negative form 	
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couldn't I rubberstamp?
couldn't you rubberstamp?
couldn't he rubberstamp?
couldn't we rubberstamp?
couldn't you rubberstamp?
couldn't they rubberstamp? 	couldn't I be rubberstamping?
couldn't you be rubberstamping?
couldn't he be rubberstamping?
couldn't we be rubberstamping?
couldn't you be rubberstamping?
couldn't they be rubberstamping? 	couldn't I have rubberstamped?
couldn't you have rubberstamped?
couldn't he have rubberstamped?
couldn't we have rubberstamped?
couldn't you have rubberstamped?
couldn't they have rubberstamped? 	couldn't I have been rubberstamping?
couldn't you have been rubberstamping?
couldn't he have been rubberstamping?
couldn't we have been rubberstamping?
couldn't you have been rubberstamping?
couldn't they have been rubberstamping?