English verb conjugation
COULD VOUCHER

Regular verb: voucher - vouchered - vouchered

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

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

Interro-negative form

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