must vapour
Regular verb: vapour - vapoured- vapoured

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't vapour
you mustn't vapour
she mustn't vapour
we mustn't vapour
you mustn't vapour
they mustn't vapour 	I mustn't be vapouring
you mustn't be vapouring
she mustn't be vapouring
we mustn't be vapouring
you mustn't be vapouring
they mustn't be vapouring	I mustn't have vapoured
you mustn't have vapoured
she mustn't have vapoured
we mustn't have vapoured
you mustn't have vapoured
they mustn't have vapoured	I mustn't have been vapouring
you mustn't have been vapouring
she mustn't have been vapouring
we mustn't have been vapouring
you mustn't have been vapouring
they mustn't have been vapouring	

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

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