English verb conjugation
MUST VAPOUR

Regular verb: vapour - vapoured - vapoured

Affirmation

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