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male gender | Modal : no | may | might | can | could | shall | should | will | would | must | ought to

English verb conjugation COULD SIGN

Regular verb: sign - signed - signed


Affirmation

Simple form
I could sign
you could sign
she could sign
we could sign
you could sign
they could sign
V-ing form
I could be signing
you could be signing
she could be signing
we could be signing
you could be signing
they could be signing
Perfect
I could have signed
you could have signed
she 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
she 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
she 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
she 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
she 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
she 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 she sign?
could we sign?
could you sign?
could they sign?
V-ing form
could I be signing?
could you be signing?
could she be signing?
could we be signing?
could you be signing?
could they be signing?
Perfect
could I have signed?
could you have signed?
could she 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 she 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 she 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 she 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 she 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 she have been signing?
couldn't we have been signing?
couldn't you have been signing?
couldn't they have been signing?