English verb conjugation
MUST CAVIL

Regular verb: cavil - cavilled - cavilled

Affirmation

Simple form	V-ing form
I must cavil you must cavil he must cavil we must cavil you must cavil they must cavil	I must be cavilling you must be cavilling he must be cavilling we must be cavilling you must be cavilling they must be cavilling
Perfect	V-ing perfect
I must have cavilled you must have cavilled he must have cavilled we must have cavilled you must have cavilled they must have cavilled	I must have been cavilling you must have been cavilling he must have been cavilling we must have been cavilling you must have been cavilling they must have been cavilling

Negation

Simple form	V-ing form
I mustn't cavil you mustn't cavil he mustn't cavil we mustn't cavil you mustn't cavil they mustn't cavil	I mustn't be cavilling you mustn't be cavilling he mustn't be cavilling we mustn't be cavilling you mustn't be cavilling they mustn't be cavilling
Perfect	V-ing perfect
I mustn't have cavilled you mustn't have cavilled he mustn't have cavilled we mustn't have cavilled you mustn't have cavilled they mustn't have cavilled	I mustn't have been cavilling you mustn't have been cavilling he mustn't have been cavilling we mustn't have been cavilling you mustn't have been cavilling they mustn't have been cavilling

Interrogative form

Simple form	V-ing form
must I cavil? must you cavil? must he cavil? must we cavil? must you cavil? must they cavil?	must I be cavilling? must you be cavilling? must he be cavilling? must we be cavilling? must you be cavilling? must they be cavilling?
Perfect	V-ing perfect
must I have cavilled? must you have cavilled? must he have cavilled? must we have cavilled? must you have cavilled? must they have cavilled?	must I have been cavilling? must you have been cavilling? must he have been cavilling? must we have been cavilling? must you have been cavilling? must they have been cavilling?

Interro-negative form

Simple form	V-ing form
mustn't I cavil? mustn't you cavil? mustn't he cavil? mustn't we cavil? mustn't you cavil? mustn't they cavil?	mustn't I be cavilling? mustn't you be cavilling? mustn't he be cavilling? mustn't we be cavilling? mustn't you be cavilling? mustn't they be cavilling?
Perfect	V-ing perfect
mustn't I have cavilled? mustn't you have cavilled? mustn't he have cavilled? mustn't we have cavilled? mustn't you have cavilled? mustn't they have cavilled?	mustn't I have been cavilling? mustn't you have been cavilling? mustn't he have been cavilling? mustn't we have been cavilling? mustn't you have been cavilling? mustn't they have been cavilling?