English verb conjugation
MUST SIUM

Regular verb: sium - siumed - siumed

Affirmation

Simple form	V-ing form
I must sium you must sium he must sium we must sium you must sium they must sium	I must be siuming you must be siuming he must be siuming we must be siuming you must be siuming they must be siuming
Perfect	V-ing perfect
I must have siumed you must have siumed he must have siumed we must have siumed you must have siumed they must have siumed	I must have been siuming you must have been siuming he must have been siuming we must have been siuming you must have been siuming they must have been siuming

Negation

Simple form	V-ing form
I mustn't sium you mustn't sium he mustn't sium we mustn't sium you mustn't sium they mustn't sium	I mustn't be siuming you mustn't be siuming he mustn't be siuming we mustn't be siuming you mustn't be siuming they mustn't be siuming
Perfect	V-ing perfect
I mustn't have siumed you mustn't have siumed he mustn't have siumed we mustn't have siumed you mustn't have siumed they mustn't have siumed	I mustn't have been siuming you mustn't have been siuming he mustn't have been siuming we mustn't have been siuming you mustn't have been siuming they mustn't have been siuming

Interrogative form

Simple form	V-ing form
must I sium? must you sium? must he sium? must we sium? must you sium? must they sium?	must I be siuming? must you be siuming? must he be siuming? must we be siuming? must you be siuming? must they be siuming?
Perfect	V-ing perfect
must I have siumed? must you have siumed? must he have siumed? must we have siumed? must you have siumed? must they have siumed?	must I have been siuming? must you have been siuming? must he have been siuming? must we have been siuming? must you have been siuming? must they have been siuming?

Interro-negative form

Simple form	V-ing form
mustn't I sium? mustn't you sium? mustn't he sium? mustn't we sium? mustn't you sium? mustn't they sium?	mustn't I be siuming? mustn't you be siuming? mustn't he be siuming? mustn't we be siuming? mustn't you be siuming? mustn't they be siuming?
Perfect	V-ing perfect
mustn't I have siumed? mustn't you have siumed? mustn't he have siumed? mustn't we have siumed? mustn't you have siumed? mustn't they have siumed?	mustn't I have been siuming? mustn't you have been siuming? mustn't he have been siuming? mustn't we have been siuming? mustn't you have been siuming? mustn't they have been siuming?