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 couldn't vapor
you couldn't vapor
he couldn't vapor
we couldn't vapor
you couldn't vapor
they couldn't vapor 	I couldn't be vaporing
you couldn't be vaporing
he couldn't be vaporing
we couldn't be vaporing
you couldn't be vaporing
they couldn't be vaporing	I couldn't have vapored
you couldn't have vapored
he couldn't have vapored
we couldn't have vapored
you couldn't have vapored
they couldn't have vapored	I couldn't have been vaporing
you couldn't have been vaporing
he couldn't have been vaporing
we couldn't have been vaporing
you couldn't have been vaporing
they couldn't 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 	
couldn't I vapor?
couldn't you vapor?
couldn't he vapor?
couldn't we vapor?
couldn't you vapor?
couldn't they vapor? 	couldn't I be vaporing?
couldn't you be vaporing?
couldn't he be vaporing?
couldn't we be vaporing?
couldn't you be vaporing?
couldn't they be vaporing? 	couldn't I have vapored?
couldn't you have vapored?
couldn't he have vapored?
couldn't we have vapored?
couldn't you have vapored?
couldn't they have vapored? 	couldn't I have been vaporing?
couldn't you have been vaporing?
couldn't he have been vaporing?
couldn't we have been vaporing?
couldn't you have been vaporing?
couldn't they have been vaporing?