English verb conjugation
COULD POSTDATE

Regular verb: postdate - postdated - postdated

Affirmation

Simple form	V-ing form
I could postdate you could postdate she could postdate we could postdate you could postdate they could postdate	I could be postdating you could be postdating she could be postdating we could be postdating you could be postdating they could be postdating
Perfect	V-ing perfect
I could have postdated you could have postdated she could have postdated we could have postdated you could have postdated they could have postdated	I could have been postdating you could have been postdating she could have been postdating we could have been postdating you could have been postdating they could have been postdating

Negation

Simple form	V-ing form
I couldn't postdate you couldn't postdate she couldn't postdate we couldn't postdate you couldn't postdate they couldn't postdate	I couldn't be postdating you couldn't be postdating she couldn't be postdating we couldn't be postdating you couldn't be postdating they couldn't be postdating
Perfect	V-ing perfect
I couldn't have postdated you couldn't have postdated she couldn't have postdated we couldn't have postdated you couldn't have postdated they couldn't have postdated	I couldn't have been postdating you couldn't have been postdating she couldn't have been postdating we couldn't have been postdating you couldn't have been postdating they couldn't have been postdating

Interrogative form

Simple form	V-ing form
could I postdate? could you postdate? could she postdate? could we postdate? could you postdate? could they postdate?	could I be postdating? could you be postdating? could she be postdating? could we be postdating? could you be postdating? could they be postdating?
Perfect	V-ing perfect
could I have postdated? could you have postdated? could she have postdated? could we have postdated? could you have postdated? could they have postdated?	could I have been postdating? could you have been postdating? could she have been postdating? could we have been postdating? could you have been postdating? could they have been postdating?

Interro-negative form

Simple form	V-ing form
couldn't I postdate? couldn't you postdate? couldn't she postdate? couldn't we postdate? couldn't you postdate? couldn't they postdate?	couldn't I be postdating? couldn't you be postdating? couldn't she be postdating? couldn't we be postdating? couldn't you be postdating? couldn't they be postdating?
Perfect	V-ing perfect
couldn't I have postdated? couldn't you have postdated? couldn't she have postdated? couldn't we have postdated? couldn't you have postdated? couldn't they have postdated?	couldn't I have been postdating? couldn't you have been postdating? couldn't she have been postdating? couldn't we have been postdating? couldn't you have been postdating? couldn't they have been postdating?