English verb conjugation
MUST FULFIL

Regular verb: fulfil - fulfilled - fulfilled

Affirmation

Simple form	V-ing form
I must fulfil you must fulfil he must fulfil we must fulfil you must fulfil they must fulfil	I must be fulfilling you must be fulfilling he must be fulfilling we must be fulfilling you must be fulfilling they must be fulfilling
Perfect	V-ing perfect
I must have fulfilled you must have fulfilled he must have fulfilled we must have fulfilled you must have fulfilled they must have fulfilled	I must have been fulfilling you must have been fulfilling he must have been fulfilling we must have been fulfilling you must have been fulfilling they must have been fulfilling

Negation

Simple form	V-ing form
I mustn't fulfil you mustn't fulfil he mustn't fulfil we mustn't fulfil you mustn't fulfil they mustn't fulfil	I mustn't be fulfilling you mustn't be fulfilling he mustn't be fulfilling we mustn't be fulfilling you mustn't be fulfilling they mustn't be fulfilling
Perfect	V-ing perfect
I mustn't have fulfilled you mustn't have fulfilled he mustn't have fulfilled we mustn't have fulfilled you mustn't have fulfilled they mustn't have fulfilled	I mustn't have been fulfilling you mustn't have been fulfilling he mustn't have been fulfilling we mustn't have been fulfilling you mustn't have been fulfilling they mustn't have been fulfilling

Interrogative form

Simple form	V-ing form
must I fulfil? must you fulfil? must he fulfil? must we fulfil? must you fulfil? must they fulfil?	must I be fulfilling? must you be fulfilling? must he be fulfilling? must we be fulfilling? must you be fulfilling? must they be fulfilling?
Perfect	V-ing perfect
must I have fulfilled? must you have fulfilled? must he have fulfilled? must we have fulfilled? must you have fulfilled? must they have fulfilled?	must I have been fulfilling? must you have been fulfilling? must he have been fulfilling? must we have been fulfilling? must you have been fulfilling? must they have been fulfilling?

Interro-negative form

Simple form	V-ing form
mustn't I fulfil? mustn't you fulfil? mustn't he fulfil? mustn't we fulfil? mustn't you fulfil? mustn't they fulfil?	mustn't I be fulfilling? mustn't you be fulfilling? mustn't he be fulfilling? mustn't we be fulfilling? mustn't you be fulfilling? mustn't they be fulfilling?
Perfect	V-ing perfect
mustn't I have fulfilled? mustn't you have fulfilled? mustn't he have fulfilled? mustn't we have fulfilled? mustn't you have fulfilled? mustn't they have fulfilled?	mustn't I have been fulfilling? mustn't you have been fulfilling? mustn't he have been fulfilling? mustn't we have been fulfilling? mustn't you have been fulfilling? mustn't they have been fulfilling?