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 must not rumble you must not rumble he must not rumble we must not rumble you must not rumble they must not rumble	I must not be rumbling you must not be rumbling he must not be rumbling we must not be rumbling you must not be rumbling they must not be rumbling
Perfect	V-ing perfect
I must not have rumbled you must not have rumbled he must not have rumbled we must not have rumbled you must not have rumbled they must not have rumbled	I must not have been rumbling you must not have been rumbling he must not have been rumbling we must not have been rumbling you must not have been rumbling they must not 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
must I not rumble? must you not rumble? must he not rumble? must we not rumble? must you not rumble? must they not rumble?	must I not be rumbling? must you not be rumbling? must he not be rumbling? must we not be rumbling? must you not be rumbling? must they not be rumbling?
Perfect	V-ing perfect
must I not have rumbled? must you not have rumbled? must he not have rumbled? must we not have rumbled? must you not have rumbled? must they not have rumbled?	must I not have been rumbling? must you not have been rumbling? must he not have been rumbling? must we not have been rumbling? must you not have been rumbling? must they not have been rumbling?