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 mustn't scum you mustn't scum he mustn't scum we mustn't scum you mustn't scum they mustn't scum	I mustn't be scumming you mustn't be scumming he mustn't be scumming we mustn't be scumming you mustn't be scumming they mustn't be scumming
Perfect	V-ing perfect
I mustn't have scummed you mustn't have scummed he mustn't have scummed we mustn't have scummed you mustn't have scummed they mustn't have scummed	I mustn't have been scumming you mustn't have been scumming he mustn't have been scumming we mustn't have been scumming you mustn't have been scumming they mustn't 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
mustn't I scum? mustn't you scum? mustn't he scum? mustn't we scum? mustn't you scum? mustn't they scum?	mustn't I be scumming? mustn't you be scumming? mustn't he be scumming? mustn't we be scumming? mustn't you be scumming? mustn't they be scumming?
Perfect	V-ing perfect
mustn't I have scummed? mustn't you have scummed? mustn't he have scummed? mustn't we have scummed? mustn't you have scummed? mustn't they have scummed?	mustn't I have been scumming? mustn't you have been scumming? mustn't he have been scumming? mustn't we have been scumming? mustn't you have been scumming? mustn't they have been scumming?