English verb conjugation
MUST SCUM

Regular verb: scum - scummed - scummed

Affirmation

Simple form	V-ing form
I must scum you must scum he must scum we must scum you must scum they must scum	I must be scumming you must be scumming he must be scumming we must be scumming you must be scumming they must be scumming
Perfect	V-ing perfect
I must have scummed you must have scummed he must have scummed we must have scummed you must have scummed they must have scummed	I must have been scumming you must have been scumming he must have been scumming we must have been scumming you must have been scumming they must have been scumming

Negation

Simple form	V-ing form
I must not scum you must not scum he must not scum we must not scum you must not scum they must not scum	I must not be scumming you must not be scumming he must not be scumming we must not be scumming you must not be scumming they must not be scumming
Perfect	V-ing perfect
I must not have scummed you must not have scummed he must not have scummed we must not have scummed you must not have scummed they must not have scummed	I must not have been scumming you must not have been scumming he must not have been scumming we must not have been scumming you must not have been scumming they must not have been scumming

Interrogative form

Simple form	V-ing form
must I scum? must you scum? must he scum? must we scum? must you scum? must they scum?	must I be scumming? must you be scumming? must he be scumming? must we be scumming? must you be scumming? must they be scumming?
Perfect	V-ing perfect
must I have scummed? must you have scummed? must he have scummed? must we have scummed? must you have scummed? must they have scummed?	must I have been scumming? must you have been scumming? must he have been scumming? must we have been scumming? must you have been scumming? must they have been scumming?

Interro-negative form

Simple form	V-ing form
must I not scum? must you not scum? must he not scum? must we not scum? must you not scum? must they not scum?	must I not be scumming? must you not be scumming? must he not be scumming? must we not be scumming? must you not be scumming? must they not be scumming?
Perfect	V-ing perfect
must I not have scummed? must you not have scummed? must he not have scummed? must we not have scummed? must you not have scummed? must they not have scummed?	must I not have been scumming? must you not have been scumming? must he not have been scumming? must we not have been scumming? must you not have been scumming? must they not have been scumming?