English verb conjugation
COULD ANTEDATE

Regular verb: antedate - antedated - antedated

Affirmation

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