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 must not vapour you must not vapour he 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 he must not be vapouring we must not be vapouring you must not be vapouring they must not be vapouring
Perfect	V-ing perfect
I must not have vapoured you must not have vapoured he 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 he 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
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
must I not vapour? must you not vapour? must he 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 he not be vapouring? must we not be vapouring? must you not be vapouring? must they not be vapouring?
Perfect	V-ing perfect
must I not have vapoured? must you not have vapoured? must he 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 he not have been vapouring? must we not have been vapouring? must you not have been vapouring? must they not have been vapouring?