could postdate
Regular verb: postdate - postdated- postdated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?