English verb conjugation
MUST SCUMBLE

Regular verb: scumble - scumbled - scumbled

Affirmation

Simple form	V-ing form
I must scumble you must scumble he must scumble we must scumble you must scumble they must scumble	I must be scumbling you must be scumbling he must be scumbling we must be scumbling you must be scumbling they must be scumbling
Perfect	V-ing perfect
I must have scumbled you must have scumbled he must have scumbled we must have scumbled you must have scumbled they must have scumbled	I must have been scumbling you must have been scumbling he must have been scumbling we must have been scumbling you must have been scumbling they must have been scumbling

Negation

Simple form	V-ing form
I mustn't scumble you mustn't scumble he mustn't scumble we mustn't scumble you mustn't scumble they mustn't scumble	I mustn't be scumbling you mustn't be scumbling he mustn't be scumbling we mustn't be scumbling you mustn't be scumbling they mustn't be scumbling
Perfect	V-ing perfect
I mustn't have scumbled you mustn't have scumbled he mustn't have scumbled we mustn't have scumbled you mustn't have scumbled they mustn't have scumbled	I mustn't have been scumbling you mustn't have been scumbling he mustn't have been scumbling we mustn't have been scumbling you mustn't have been scumbling they mustn't have been scumbling

Interrogative form

Simple form	V-ing form
must I scumble? must you scumble? must he scumble? must we scumble? must you scumble? must they scumble?	must I be scumbling? must you be scumbling? must he be scumbling? must we be scumbling? must you be scumbling? must they be scumbling?
Perfect	V-ing perfect
must I have scumbled? must you have scumbled? must he have scumbled? must we have scumbled? must you have scumbled? must they have scumbled?	must I have been scumbling? must you have been scumbling? must he have been scumbling? must we have been scumbling? must you have been scumbling? must they have been scumbling?

Interro-negative form

Simple form	V-ing form
mustn't I scumble? mustn't you scumble? mustn't he scumble? mustn't we scumble? mustn't you scumble? mustn't they scumble?	mustn't I be scumbling? mustn't you be scumbling? mustn't he be scumbling? mustn't we be scumbling? mustn't you be scumbling? mustn't they be scumbling?
Perfect	V-ing perfect
mustn't I have scumbled? mustn't you have scumbled? mustn't he have scumbled? mustn't we have scumbled? mustn't you have scumbled? mustn't they have scumbled?	mustn't I have been scumbling? mustn't you have been scumbling? mustn't he have been scumbling? mustn't we have been scumbling? mustn't you have been scumbling? mustn't they have been scumbling?