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 must not vapour
you must not vapour
she must not vapour
we must not vapour
you must not vapour
they must not vapour 	I must not be vapouring
you must not be vapouring
she must not be vapouring
we must not be vapouring
you must not be vapouring
they must not be vapouring	I must not have vapoured
you must not have vapoured
she must not have vapoured
we must not have vapoured
you must not have vapoured
they must not have vapoured	I must not have been vapouring
you must not have been vapouring
she must not have been vapouring
we must not have been vapouring
you must not have been vapouring
they must not 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 	
must I not vapour?
must you not vapour?
must she not vapour?
must we not vapour?
must you not vapour?
must they not vapour? 	must I not be vapouring?
must you not be vapouring?
must she not be vapouring?
must we not be vapouring?
must you not be vapouring?
must they not be vapouring? 	must I not have vapoured?
must you not have vapoured?
must she not have vapoured?
must we not have vapoured?
must you not have vapoured?
must they not have vapoured? 	must I not have been vapouring?
must you not have been vapouring?
must she not have been vapouring?
must we not have been vapouring?
must you not have been vapouring?
must they not have been vapouring?