English verb conjugation COULD UNDERSIGN

Regular verb: undersign - undersigned - undersigned

Affirmation

Simple form

I could undersign
you could undersign
he could undersign
we could undersign
you could undersign
they could undersign

V-ing form

I could be undersigning
you could be undersigning
he could be undersigning
we could be undersigning
you could be undersigning
they could be undersigning

Perfect

I could have undersigned
you could have undersigned
he could have undersigned
we could have undersigned
you could have undersigned
they could have undersigned

V-ing perfect

I could have been undersigning
you could have been undersigning
he could have been undersigning
we could have been undersigning
you could have been undersigning
they could have been undersigning

Negation

Simple form

I could not undersign
you could not undersign
he could not undersign
we could not undersign
you could not undersign
they could not undersign

V-ing form

I could not be undersigning
you could not be undersigning
he could not be undersigning
we could not be undersigning
you could not be undersigning
they could not be undersigning

Perfect

I could not have undersigned
you could not have undersigned
he could not have undersigned
we could not have undersigned
you could not have undersigned
they could not have undersigned

V-ing perfect

I could not have been undersigning
you could not have been undersigning
he could not have been undersigning
we could not have been undersigning
you could not have been undersigning
they could not have been undersigning

Interrogative form

Simple form

could I undersign?
could you undersign?
could he undersign?
could we undersign?
could you undersign?
could they undersign?

V-ing form

could I be undersigning?
could you be undersigning?
could he be undersigning?
could we be undersigning?
could you be undersigning?
could they be undersigning?

Perfect

could I have undersigned?
could you have undersigned?
could he have undersigned?
could we have undersigned?
could you have undersigned?
could they have undersigned?

V-ing perfect

could I have been undersigning?
could you have been undersigning?
could he have been undersigning?
could we have been undersigning?
could you have been undersigning?
could they have been undersigning?

Interro-negative form

Simple form

could I not undersign?
could you not undersign?
could he not undersign?
could we not undersign?
could you not undersign?
could they not undersign?

V-ing form

could I not be undersigning?
could you not be undersigning?
could he not be undersigning?
could we not be undersigning?
could you not be undersigning?
could they not be undersigning?

Perfect

could I not have undersigned?
could you not have undersigned?
could he not have undersigned?
could we not have undersigned?
could you not have undersigned?
could they not have undersigned?

V-ing perfect

could I not have been undersigning?
could you not have been undersigning?
could he not have been undersigning?
could we not have been undersigning?
could you not have been undersigning?
could they not have been undersigning?

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