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 must not sium you must not sium he must not sium we must not sium you must not sium they must not sium	I must not be siuming you must not be siuming he must not be siuming we must not be siuming you must not be siuming they must not be siuming
Perfect	V-ing perfect
I must not have siumed you must not have siumed he must not have siumed we must not have siumed you must not have siumed they must not have siumed	I must not have been siuming you must not have been siuming he must not have been siuming we must not have been siuming you must not have been siuming they must not 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
must I not sium? must you not sium? must he not sium? must we not sium? must you not sium? must they not sium?	must I not be siuming? must you not be siuming? must he not be siuming? must we not be siuming? must you not be siuming? must they not be siuming?
Perfect	V-ing perfect
must I not have siumed? must you not have siumed? must he not have siumed? must we not have siumed? must you not have siumed? must they not have siumed?	must I not have been siuming? must you not have been siuming? must he not have been siuming? must we not have been siuming? must you not have been siuming? must they not have been siuming?