English verb conjugation
CAN VOUCHER

Regular verb: voucher - vouchered - vouchered

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?