could vapour
Regular verb: vapour - vapoured- vapoured

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could vapour
you could vapour
she could vapour
we could vapour
you could vapour
they could vapour 	I could be vapouring
you could be vapouring
she could be vapouring
we could be vapouring
you could be vapouring
they could be vapouring	I could have vapoured
you could have vapoured
she could have vapoured
we could have vapoured
you could have vapoured
they could have vapoured	I could have been vapouring
you could have been vapouring
she could have been vapouring
we could have been vapouring
you could have been vapouring
they could have been vapouring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not vapour
you could not vapour
she could not vapour
we could not vapour
you could not vapour
they could not vapour 	I could not be vapouring
you could not be vapouring
she could not be vapouring
we could not be vapouring
you could not be vapouring
they could not be vapouring	I could not have vapoured
you could not have vapoured
she could not have vapoured
we could not have vapoured
you could not have vapoured
they could not have vapoured	I could not have been vapouring
you could not have been vapouring
she could not have been vapouring
we could not have been vapouring
you could not have been vapouring
they could not have been vapouring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I vapour?
could you vapour?
could she vapour?
could we vapour?
could you vapour?
could they vapour? 	could I be vapouring?
could you be vapouring?
could she be vapouring?
could we be vapouring?
could you be vapouring?
could they be vapouring? 	could I have vapoured?
could you have vapoured?
could she have vapoured?
could we have vapoured?
could you have vapoured?
could they have vapoured? 	could I have been vapouring?
could you have been vapouring?
could she have been vapouring?
could we have been vapouring?
could you have been vapouring?
could they have been vapouring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not vapour?
could you not vapour?
could she not vapour?
could we not vapour?
could you not vapour?
could they not vapour? 	could I not be vapouring?
could you not be vapouring?
could she not be vapouring?
could we not be vapouring?
could you not be vapouring?
could they not be vapouring? 	could I not have vapoured?
could you not have vapoured?
could she not have vapoured?
could we not have vapoured?
could you not have vapoured?
could they not have vapoured? 	could I not have been vapouring?
could you not have been vapouring?
could she not have been vapouring?
could we not have been vapouring?
could you not have been vapouring?
could they not have been vapouring?