could voucher
Verbe régulier : voucher - vouchered- vouchered

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could voucher
you could voucher
he could voucher
we could voucher
you could voucher
they could voucher 	I could be vouchering
you could be vouchering
he could be vouchering
we could be vouchering
you could be vouchering
they could be vouchering	I could have vouchered
you could have vouchered
he could have vouchered
we could have vouchered
you could have vouchered
they could have vouchered	I could have been vouchering
you could have been vouchering
he could have been vouchering
we could have been vouchering
you could have been vouchering
they could have been vouchering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not voucher
you could not voucher
he could not voucher
we could not voucher
you could not voucher
they could not voucher 	I could not be vouchering
you could not be vouchering
he could not be vouchering
we could not be vouchering
you could not be vouchering
they could not be vouchering	I could not have vouchered
you could not have vouchered
he could not have vouchered
we could not have vouchered
you could not have vouchered
they could not have vouchered	I could not have been vouchering
you could not have been vouchering
he could not have been vouchering
we could not have been vouchering
you could not have been vouchering
they could not have been vouchering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I voucher?
could you voucher?
could he voucher?
could we voucher?
could you voucher?
could they voucher? 	could I be vouchering?
could you be vouchering?
could he be vouchering?
could we be vouchering?
could you be vouchering?
could they be vouchering? 	could I have vouchered?
could you have vouchered?
could he have vouchered?
could we have vouchered?
could you have vouchered?
could they have vouchered? 	could I have been vouchering?
could you have been vouchering?
could he have been vouchering?
could we have been vouchering?
could you have been vouchering?
could they have been vouchering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not voucher?
could you not voucher?
could he not voucher?
could we not voucher?
could you not voucher?
could they not voucher? 	could I not be vouchering?
could you not be vouchering?
could he not be vouchering?
could we not be vouchering?
could you not be vouchering?
could they not be vouchering? 	could I not have vouchered?
could you not have vouchered?
could he not have vouchered?
could we not have vouchered?
could you not have vouchered?
could they not have vouchered? 	could I not have been vouchering?
could you not have been vouchering?
could he not have been vouchering?
could we not have been vouchering?
could you not have been vouchering?
could they not have been vouchering?