could antedate
Verbo regular: antedate - antedated- antedated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't antedate
you couldn't antedate
he 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
he 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
he 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
he couldn't have been antedating
we couldn't have been antedating
you couldn't have been antedating
they couldn't have been antedating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
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? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I antedate?
couldn't you antedate?
couldn't he 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 he 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 he 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 he have been antedating?
couldn't we have been antedating?
couldn't you have been antedating?
couldn't they have been antedating?