could alternate
Verbe régulier : alternate - alternated- alternated
Traduction française : alterner - (faire) alterner 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could alternate
you could alternate
he could alternate
we could alternate
you could alternate
they could alternate 	I could be alternating
you could be alternating
he could be alternating
we could be alternating
you could be alternating
they could be alternating	I could have alternated
you could have alternated
he could have alternated
we could have alternated
you could have alternated
they could have alternated	I could have been alternating
you could have been alternating
he could have been alternating
we could have been alternating
you could have been alternating
they could have been alternating	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not alternate
you could not alternate
he could not alternate
we could not alternate
you could not alternate
they could not alternate 	I could not be alternating
you could not be alternating
he could not be alternating
we could not be alternating
you could not be alternating
they could not be alternating	I could not have alternated
you could not have alternated
he could not have alternated
we could not have alternated
you could not have alternated
they could not have alternated	I could not have been alternating
you could not have been alternating
he could not have been alternating
we could not have been alternating
you could not have been alternating
they could not have been alternating	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I alternate?
could you alternate?
could he alternate?
could we alternate?
could you alternate?
could they alternate? 	could I be alternating?
could you be alternating?
could he be alternating?
could we be alternating?
could you be alternating?
could they be alternating? 	could I have alternated?
could you have alternated?
could he have alternated?
could we have alternated?
could you have alternated?
could they have alternated? 	could I have been alternating?
could you have been alternating?
could he have been alternating?
could we have been alternating?
could you have been alternating?
could they have been alternating? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not alternate?
could you not alternate?
could he not alternate?
could we not alternate?
could you not alternate?
could they not alternate? 	could I not be alternating?
could you not be alternating?
could he not be alternating?
could we not be alternating?
could you not be alternating?
could they not be alternating? 	could I not have alternated?
could you not have alternated?
could he not have alternated?
could we not have alternated?
could you not have alternated?
could they not have alternated? 	could I not have been alternating?
could you not have been alternating?
could he not have been alternating?
could we not have been alternating?
could you not have been alternating?
could they not have been alternating?