can postdate
Regular verb: postdate - postdated- postdated

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

Negation 	
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I cannot postdate
you cannot postdate
she cannot postdate
we cannot postdate
you cannot postdate
they cannot postdate 	I cannot be postdating
you cannot be postdating
she cannot be postdating
we cannot be postdating
you cannot be postdating
they cannot be postdating	I cannot have postdated
you cannot have postdated
she cannot have postdated
we cannot have postdated
you cannot have postdated
they cannot have postdated	I cannot have been postdating
you cannot have been postdating
she cannot have been postdating
we cannot have been postdating
you cannot have been postdating
they cannot have been postdating	

Interrogative form 	
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can I postdate?
can you postdate?
can she postdate?
can we postdate?
can you postdate?
can they postdate? 	can I be postdating?
can you be postdating?
can she be postdating?
can we be postdating?
can you be postdating?
can they be postdating? 	can I have postdated?
can you have postdated?
can she have postdated?
can we have postdated?
can you have postdated?
can they have postdated? 	can I have been postdating?
can you have been postdating?
can she have been postdating?
can we have been postdating?
can you have been postdating?
can they have been postdating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not postdate?
can you not postdate?
can she not postdate?
can we not postdate?
can you not postdate?
can they not postdate? 	can I not be postdating?
can you not be postdating?
can she not be postdating?
can we not be postdating?
can you not be postdating?
can they not be postdating? 	can I not have postdated?
can you not have postdated?
can she not have postdated?
can we not have postdated?
can you not have postdated?
can they not have postdated? 	can I not have been postdating?
can you not have been postdating?
can she not have been postdating?
can we not have been postdating?
can you not have been postdating?
can they not have been postdating?