could antedate
Regular verb: antedate - antedated- antedated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could antedate
you could antedate
she could antedate
we could antedate
you could antedate
they could antedate 	I could be antedating
you could be antedating
she could be antedating
we could be antedating
you could be antedating
they could be antedating	I could have antedated
you could have antedated
she 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
she 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 couldn't antedate
you couldn't antedate
she couldn't antedate
we couldn't antedate
you couldn't antedate
they couldn't antedate 	I couldn't be antedating
you couldn't be antedating
she couldn't be antedating
we couldn't be antedating
you couldn't be antedating
they couldn't be antedating	I couldn't have antedated
you couldn't have antedated
she couldn't have antedated
we couldn't have antedated
you couldn't have antedated
they couldn't have antedated	I couldn't have been antedating
you couldn't have been antedating
she couldn't have been antedating
we couldn't have been antedating
you couldn't have been antedating
they couldn't have been antedating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I antedate?
could you antedate?
could she antedate?
could we antedate?
could you antedate?
could they antedate? 	could I be antedating?
could you be antedating?
could she be antedating?
could we be antedating?
could you be antedating?
could they be antedating? 	could I have antedated?
could you have antedated?
could she 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 she 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 	
couldn't I antedate?
couldn't you antedate?
couldn't she antedate?
couldn't we antedate?
couldn't you antedate?
couldn't they antedate? 	couldn't I be antedating?
couldn't you be antedating?
couldn't she be antedating?
couldn't we be antedating?
couldn't you be antedating?
couldn't they be antedating? 	couldn't I have antedated?
couldn't you have antedated?
couldn't she have antedated?
couldn't we have antedated?
couldn't you have antedated?
couldn't they have antedated? 	couldn't I have been antedating?
couldn't you have been antedating?
couldn't she have been antedating?
couldn't we have been antedating?
couldn't you have been antedating?
couldn't they have been antedating?