English verb conjugation
MUST FORM

Regular verb: form - formed - formed

Affirmation

Simple form	V-ing form
I must form you must form he must form we must form you must form they must form	I must be forming you must be forming he must be forming we must be forming you must be forming they must be forming
Perfect	V-ing perfect
I must have formed you must have formed he must have formed we must have formed you must have formed they must have formed	I must have been forming you must have been forming he must have been forming we must have been forming you must have been forming they must have been forming

Negation

Simple form	V-ing form
I mustn't form you mustn't form he mustn't form we mustn't form you mustn't form they mustn't form	I mustn't be forming you mustn't be forming he mustn't be forming we mustn't be forming you mustn't be forming they mustn't be forming
Perfect	V-ing perfect
I mustn't have formed you mustn't have formed he mustn't have formed we mustn't have formed you mustn't have formed they mustn't have formed	I mustn't have been forming you mustn't have been forming he mustn't have been forming we mustn't have been forming you mustn't have been forming they mustn't have been forming

Interrogative form

Simple form	V-ing form
must I form? must you form? must he form? must we form? must you form? must they form?	must I be forming? must you be forming? must he be forming? must we be forming? must you be forming? must they be forming?
Perfect	V-ing perfect
must I have formed? must you have formed? must he have formed? must we have formed? must you have formed? must they have formed?	must I have been forming? must you have been forming? must he have been forming? must we have been forming? must you have been forming? must they have been forming?

Interro-negative form

Simple form	V-ing form
mustn't I form? mustn't you form? mustn't he form? mustn't we form? mustn't you form? mustn't they form?	mustn't I be forming? mustn't you be forming? mustn't he be forming? mustn't we be forming? mustn't you be forming? mustn't they be forming?
Perfect	V-ing perfect
mustn't I have formed? mustn't you have formed? mustn't he have formed? mustn't we have formed? mustn't you have formed? mustn't they have formed?	mustn't I have been forming? mustn't you have been forming? mustn't he have been forming? mustn't we have been forming? mustn't you have been forming? mustn't they have been forming?