English verb conjugation COULD UNDERSIGN

Regular verb: undersign - undersigned - undersigned

Affirmation

Simple form

I could undersign
you could undersign
she could undersign
we could undersign
you could undersign
they could undersign

V-ing form

I could be undersigning
you could be undersigning
she could be undersigning
we could be undersigning
you could be undersigning
they could be undersigning

Perfect

I could have undersigned
you could have undersigned
she 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
she could have been undersigning
we could have been undersigning
you could have been undersigning
they could have been undersigning

Negation

Simple form

I couldn't undersign
you couldn't undersign
she couldn't undersign
we couldn't undersign
you couldn't undersign
they couldn't undersign

V-ing form

I couldn't be undersigning
you couldn't be undersigning
she couldn't be undersigning
we couldn't be undersigning
you couldn't be undersigning
they couldn't be undersigning

Perfect

I couldn't have undersigned
you couldn't have undersigned
she couldn't have undersigned
we couldn't have undersigned
you couldn't have undersigned
they couldn't have undersigned

V-ing perfect

I couldn't have been undersigning
you couldn't have been undersigning
she couldn't have been undersigning
we couldn't have been undersigning
you couldn't have been undersigning
they couldn't have been undersigning

Interrogative form

Simple form

could I undersign?
could you undersign?
could she undersign?
could we undersign?
could you undersign?
could they undersign?

V-ing form

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

Perfect

could I have undersigned?
could you have undersigned?
could she 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 she have been undersigning?
could we have been undersigning?
could you have been undersigning?
could they have been undersigning?

Interro-negative form

Simple form

couldn't I undersign?
couldn't you undersign?
couldn't she undersign?
couldn't we undersign?
couldn't you undersign?
couldn't they undersign?

V-ing form

couldn't I be undersigning?
couldn't you be undersigning?
couldn't she be undersigning?
couldn't we be undersigning?
couldn't you be undersigning?
couldn't they be undersigning?

Perfect

couldn't I have undersigned?
couldn't you have undersigned?
couldn't she have undersigned?
couldn't we have undersigned?
couldn't you have undersigned?
couldn't they have undersigned?

V-ing perfect

couldn't I have been undersigning?
couldn't you have been undersigning?
couldn't she have been undersigning?
couldn't we have been undersigning?
couldn't you have been undersigning?
couldn't they have been undersigning?

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