could vapor
Regular verb: vapor - vapored- vapored

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could vapor
you could vapor
he could vapor
we could vapor
you could vapor
they could vapor 	I could be vaporing
you could be vaporing
he could be vaporing
we could be vaporing
you could be vaporing
they could be vaporing	I could have vapored
you could have vapored
he could have vapored
we could have vapored
you could have vapored
they could have vapored	I could have been vaporing
you could have been vaporing
he could have been vaporing
we could have been vaporing
you could have been vaporing
they could have been vaporing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not vapor
you could not vapor
he could not vapor
we could not vapor
you could not vapor
they could not vapor 	I could not be vaporing
you could not be vaporing
he could not be vaporing
we could not be vaporing
you could not be vaporing
they could not be vaporing	I could not have vapored
you could not have vapored
he could not have vapored
we could not have vapored
you could not have vapored
they could not have vapored	I could not have been vaporing
you could not have been vaporing
he could not have been vaporing
we could not have been vaporing
you could not have been vaporing
they could not have been vaporing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I vapor?
could you vapor?
could he vapor?
could we vapor?
could you vapor?
could they vapor? 	could I be vaporing?
could you be vaporing?
could he be vaporing?
could we be vaporing?
could you be vaporing?
could they be vaporing? 	could I have vapored?
could you have vapored?
could he have vapored?
could we have vapored?
could you have vapored?
could they have vapored? 	could I have been vaporing?
could you have been vaporing?
could he have been vaporing?
could we have been vaporing?
could you have been vaporing?
could they have been vaporing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not vapor?
could you not vapor?
could he not vapor?
could we not vapor?
could you not vapor?
could they not vapor? 	could I not be vaporing?
could you not be vaporing?
could he not be vaporing?
could we not be vaporing?
could you not be vaporing?
could they not be vaporing? 	could I not have vapored?
could you not have vapored?
could he not have vapored?
could we not have vapored?
could you not have vapored?
could they not have vapored? 	could I not have been vaporing?
could you not have been vaporing?
could he not have been vaporing?
could we not have been vaporing?
could you not have been vaporing?
could they not have been vaporing?