English verb conjugation
MUST RUMBLE

Regular verb: rumble - rumbled - rumbled

Affirmation

Simple form	V-ing form
I must rumble you must rumble he must rumble we must rumble you must rumble they must rumble	I must be rumbling you must be rumbling he must be rumbling we must be rumbling you must be rumbling they must be rumbling
Perfect	V-ing perfect
I must have rumbled you must have rumbled he must have rumbled we must have rumbled you must have rumbled they must have rumbled	I must have been rumbling you must have been rumbling he must have been rumbling we must have been rumbling you must have been rumbling they must have been rumbling

Negation

Simple form	V-ing form
I mustn't rumble you mustn't rumble he mustn't rumble we mustn't rumble you mustn't rumble they mustn't rumble	I mustn't be rumbling you mustn't be rumbling he mustn't be rumbling we mustn't be rumbling you mustn't be rumbling they mustn't be rumbling
Perfect	V-ing perfect
I mustn't have rumbled you mustn't have rumbled he mustn't have rumbled we mustn't have rumbled you mustn't have rumbled they mustn't have rumbled	I mustn't have been rumbling you mustn't have been rumbling he mustn't have been rumbling we mustn't have been rumbling you mustn't have been rumbling they mustn't have been rumbling

Interrogative form

Simple form	V-ing form
must I rumble? must you rumble? must he rumble? must we rumble? must you rumble? must they rumble?	must I be rumbling? must you be rumbling? must he be rumbling? must we be rumbling? must you be rumbling? must they be rumbling?
Perfect	V-ing perfect
must I have rumbled? must you have rumbled? must he have rumbled? must we have rumbled? must you have rumbled? must they have rumbled?	must I have been rumbling? must you have been rumbling? must he have been rumbling? must we have been rumbling? must you have been rumbling? must they have been rumbling?

Interro-negative form

Simple form	V-ing form
mustn't I rumble? mustn't you rumble? mustn't he rumble? mustn't we rumble? mustn't you rumble? mustn't they rumble?	mustn't I be rumbling? mustn't you be rumbling? mustn't he be rumbling? mustn't we be rumbling? mustn't you be rumbling? mustn't they be rumbling?
Perfect	V-ing perfect
mustn't I have rumbled? mustn't you have rumbled? mustn't he have rumbled? mustn't we have rumbled? mustn't you have rumbled? mustn't they have rumbled?	mustn't I have been rumbling? mustn't you have been rumbling? mustn't he have been rumbling? mustn't we have been rumbling? mustn't you have been rumbling? mustn't they have been rumbling?