could stamp
Verbo regular: stamp - stamped- stamped

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could stamp
you could stamp
he could stamp
we could stamp
you could stamp
they could stamp 	I could be stamping
you could be stamping
he could be stamping
we could be stamping
you could be stamping
they could be stamping	I could have stamped
you could have stamped
he could have stamped
we could have stamped
you could have stamped
they could have stamped	I could have been stamping
you could have been stamping
he could have been stamping
we could have been stamping
you could have been stamping
they could have been stamping	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not stamp
you could not stamp
he could not stamp
we could not stamp
you could not stamp
they could not stamp 	I could not be stamping
you could not be stamping
he could not be stamping
we could not be stamping
you could not be stamping
they could not be stamping	I could not have stamped
you could not have stamped
he could not have stamped
we could not have stamped
you could not have stamped
they could not have stamped	I could not have been stamping
you could not have been stamping
he could not have been stamping
we could not have been stamping
you could not have been stamping
they could not have been stamping	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I stamp?
could you stamp?
could he stamp?
could we stamp?
could you stamp?
could they stamp? 	could I be stamping?
could you be stamping?
could he be stamping?
could we be stamping?
could you be stamping?
could they be stamping? 	could I have stamped?
could you have stamped?
could he have stamped?
could we have stamped?
could you have stamped?
could they have stamped? 	could I have been stamping?
could you have been stamping?
could he have been stamping?
could we have been stamping?
could you have been stamping?
could they have been stamping? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not stamp?
could you not stamp?
could he not stamp?
could we not stamp?
could you not stamp?
could they not stamp? 	could I not be stamping?
could you not be stamping?
could he not be stamping?
could we not be stamping?
could you not be stamping?
could they not be stamping? 	could I not have stamped?
could you not have stamped?
could he not have stamped?
could we not have stamped?
could you not have stamped?
could they not have stamped? 	could I not have been stamping?
could you not have been stamping?
could he not have been stamping?
could we not have been stamping?
could you not have been stamping?
could they not have been stamping?