English verb conjugation
COULD POSTDATE

Regular verb: postdate - postdated - postdated

Affirmation

Simple form	V-ing form
I could postdate you could postdate he could postdate we could postdate you could postdate they could postdate	I could be postdating you could be postdating he 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 he 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 he 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 could not postdate you could not postdate he could not postdate we could not postdate you could not postdate they could not postdate	I could not be postdating you could not be postdating he could not be postdating we could not be postdating you could not be postdating they could not be postdating
Perfect	V-ing perfect
I could not have postdated you could not have postdated he could not have postdated we could not have postdated you could not have postdated they could not have postdated	I could not have been postdating you could not have been postdating he could not have been postdating we could not have been postdating you could not have been postdating they could not have been postdating

Interrogative form

Simple form	V-ing form
could I postdate? could you postdate? could he postdate? could we postdate? could you postdate? could they postdate?	could I be postdating? could you be postdating? could he 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 he 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 he 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
could I not postdate? could you not postdate? could he not postdate? could we not postdate? could you not postdate? could they not postdate?	could I not be postdating? could you not be postdating? could he not be postdating? could we not be postdating? could you not be postdating? could they not be postdating?
Perfect	V-ing perfect
could I not have postdated? could you not have postdated? could he not have postdated? could we not have postdated? could you not have postdated? could they not have postdated?	could I not have been postdating? could you not have been postdating? could he not have been postdating? could we not have been postdating? could you not have been postdating? could they not have been postdating?