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 can't voucher you can't voucher he can't voucher we can't voucher you can't voucher they can't voucher	I can't be vouchering you can't be vouchering he can't be vouchering we can't be vouchering you can't be vouchering they can't be vouchering
Perfect	V-ing perfect
I can't have vouchered you can't have vouchered he can't have vouchered we can't have vouchered you can't have vouchered they can't have vouchered	I can't have been vouchering you can't have been vouchering he can't have been vouchering we can't have been vouchering you can't have been vouchering they can't 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't I voucher? can't you voucher? can't he voucher? can't we voucher? can't you voucher? can't they voucher?	can't I be vouchering? can't you be vouchering? can't he be vouchering? can't we be vouchering? can't you be vouchering? can't they be vouchering?
Perfect	V-ing perfect
can't I have vouchered? can't you have vouchered? can't he have vouchered? can't we have vouchered? can't you have vouchered? can't they have vouchered?	can't I have been vouchering? can't you have been vouchering? can't he have been vouchering? can't we have been vouchering? can't you have been vouchering? can't they have been vouchering?