could antedate
Regular verb: antedate - antedated- antedated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could antedate
you could antedate
he could antedate
we could antedate
you could antedate
they could antedate 	I could be antedating
you could be antedating
he could be antedating
we could be antedating
you could be antedating
they could be antedating	I could have antedated
you could have antedated
he could have antedated
we could have antedated
you could have antedated
they could have antedated	I could have been antedating
you could have been antedating
he could have been antedating
we could have been antedating
you could have been antedating
they could have been antedating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not antedate
you could not antedate
he could not antedate
we could not antedate
you could not antedate
they could not antedate 	I could not be antedating
you could not be antedating
he could not be antedating
we could not be antedating
you could not be antedating
they could not be antedating	I could not have antedated
you could not have antedated
he could not have antedated
we could not have antedated
you could not have antedated
they could not have antedated	I could not have been antedating
you could not have been antedating
he could not have been antedating
we could not have been antedating
you could not have been antedating
they could not have been antedating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I antedate?
could you antedate?
could he antedate?
could we antedate?
could you antedate?
could they antedate? 	could I be antedating?
could you be antedating?
could he be antedating?
could we be antedating?
could you be antedating?
could they be antedating? 	could I have antedated?
could you have antedated?
could he have antedated?
could we have antedated?
could you have antedated?
could they have antedated? 	could I have been antedating?
could you have been antedating?
could he have been antedating?
could we have been antedating?
could you have been antedating?
could they have been antedating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not antedate?
could you not antedate?
could he not antedate?
could we not antedate?
could you not antedate?
could they not antedate? 	could I not be antedating?
could you not be antedating?
could he not be antedating?
could we not be antedating?
could you not be antedating?
could they not be antedating? 	could I not have antedated?
could you not have antedated?
could he not have antedated?
could we not have antedated?
could you not have antedated?
could they not have antedated? 	could I not have been antedating?
could you not have been antedating?
could he not have been antedating?
could we not have been antedating?
could you not have been antedating?
could they not have been antedating?