could vapour
Regular verb: vapour - vapoured- vapoured

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could vapour
you could vapour
he could vapour
we could vapour
you could vapour
they could vapour 	I could be vapouring
you could be vapouring
he could be vapouring
we could be vapouring
you could be vapouring
they could be vapouring	I could have vapoured
you could have vapoured
he 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
he 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 couldn't vapour
you couldn't vapour
he couldn't vapour
we couldn't vapour
you couldn't vapour
they couldn't vapour 	I couldn't be vapouring
you couldn't be vapouring
he couldn't be vapouring
we couldn't be vapouring
you couldn't be vapouring
they couldn't be vapouring	I couldn't have vapoured
you couldn't have vapoured
he couldn't have vapoured
we couldn't have vapoured
you couldn't have vapoured
they couldn't have vapoured	I couldn't have been vapouring
you couldn't have been vapouring
he couldn't have been vapouring
we couldn't have been vapouring
you couldn't have been vapouring
they couldn't have been vapouring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I vapour?
could you vapour?
could he vapour?
could we vapour?
could you vapour?
could they vapour? 	could I be vapouring?
could you be vapouring?
could he be vapouring?
could we be vapouring?
could you be vapouring?
could they be vapouring? 	could I have vapoured?
could you have vapoured?
could he 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 he 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 	
couldn't I vapour?
couldn't you vapour?
couldn't he vapour?
couldn't we vapour?
couldn't you vapour?
couldn't they vapour? 	couldn't I be vapouring?
couldn't you be vapouring?
couldn't he be vapouring?
couldn't we be vapouring?
couldn't you be vapouring?
couldn't they be vapouring? 	couldn't I have vapoured?
couldn't you have vapoured?
couldn't he have vapoured?
couldn't we have vapoured?
couldn't you have vapoured?
couldn't they have vapoured? 	couldn't I have been vapouring?
couldn't you have been vapouring?
couldn't he have been vapouring?
couldn't we have been vapouring?
couldn't you have been vapouring?
couldn't they have been vapouring?