English verb conjugation COULD SIGN

Regular verb: sign - signed - signed

Affirmation

Simple form

I could sign
you could sign
he could sign
we could sign
you could sign
they could sign

V-ing form

I could be signing
you could be signing
he could be signing
we could be signing
you could be signing
they could be signing

Perfect

I could have signed
you could have signed
he could have signed
we could have signed
you could have signed
they could have signed

V-ing perfect

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

Negation

Simple form

I couldn't sign
you couldn't sign
he couldn't sign
we couldn't sign
you couldn't sign
they couldn't sign

V-ing form

I couldn't be signing
you couldn't be signing
he couldn't be signing
we couldn't be signing
you couldn't be signing
they couldn't be signing

Perfect

I couldn't have signed
you couldn't have signed
he couldn't have signed
we couldn't have signed
you couldn't have signed
they couldn't have signed

V-ing perfect

I couldn't have been signing
you couldn't have been signing
he couldn't have been signing
we couldn't have been signing
you couldn't have been signing
they couldn't have been signing

Interrogative form

Simple form

could I sign?
could you sign?
could he sign?
could we sign?
could you sign?
could they sign?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

couldn't I sign?
couldn't you sign?
couldn't he sign?
couldn't we sign?
couldn't you sign?
couldn't they sign?

V-ing form

couldn't I be signing?
couldn't you be signing?
couldn't he be signing?
couldn't we be signing?
couldn't you be signing?
couldn't they be signing?

Perfect

couldn't I have signed?
couldn't you have signed?
couldn't he have signed?
couldn't we have signed?
couldn't you have signed?
couldn't they have signed?

V-ing perfect

couldn't I have been signing?
couldn't you have been signing?
couldn't he have been signing?
couldn't we have been signing?
couldn't you have been signing?
couldn't they have been signing?

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