can voucher
Verbo regular: voucher - vouchered- vouchered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can voucher
you can voucher
he can voucher
we can voucher
you can voucher
they can voucher 	I can be vouchering
you can be vouchering
he can be vouchering
we can be vouchering
you can be vouchering
they can be vouchering	I can have vouchered
you can have vouchered
he can have vouchered
we can have vouchered
you can have vouchered
they can have vouchered	I can have been vouchering
you can have been vouchering
he can have been vouchering
we can have been vouchering
you can have been vouchering
they can have been vouchering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I cannot voucher
you cannot voucher
he cannot voucher
we cannot voucher
you cannot voucher
they cannot voucher 	I cannot be vouchering
you cannot be vouchering
he cannot be vouchering
we cannot be vouchering
you cannot be vouchering
they cannot be vouchering	I cannot have vouchered
you cannot have vouchered
he cannot have vouchered
we cannot have vouchered
you cannot have vouchered
they cannot have vouchered	I cannot have been vouchering
you cannot have been vouchering
he cannot have been vouchering
we cannot have been vouchering
you cannot have been vouchering
they cannot have been vouchering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I voucher?
can you voucher?
can he voucher?
can we voucher?
can you voucher?
can they voucher? 	can I be vouchering?
can you be vouchering?
can he be vouchering?
can we be vouchering?
can you be vouchering?
can they be vouchering? 	can I have vouchered?
can you have vouchered?
can he have vouchered?
can we have vouchered?
can you have vouchered?
can they have vouchered? 	can I have been vouchering?
can you have been vouchering?
can he have been vouchering?
can we have been vouchering?
can you have been vouchering?
can they have been vouchering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I not voucher?
can you not voucher?
can he not voucher?
can we not voucher?
can you not voucher?
can they not voucher? 	can I not be vouchering?
can you not be vouchering?
can he not be vouchering?
can we not be vouchering?
can you not be vouchering?
can they not be vouchering? 	can I not have vouchered?
can you not have vouchered?
can he not have vouchered?
can we not have vouchered?
can you not have vouchered?
can they not have vouchered? 	can I not have been vouchering?
can you not have been vouchering?
can he not have been vouchering?
can we not have been vouchering?
can you not have been vouchering?
can they not have been vouchering?