English verb conjugation
MUST FUEL

Regular verb: fuel - fuelled - fuelled

Affirmation

Simple form	V-ing form
I must fuel you must fuel he must fuel we must fuel you must fuel they must fuel	I must be fuelling you must be fuelling he must be fuelling we must be fuelling you must be fuelling they must be fuelling
Perfect	V-ing perfect
I must have fuelled you must have fuelled he must have fuelled we must have fuelled you must have fuelled they must have fuelled	I must have been fuelling you must have been fuelling he must have been fuelling we must have been fuelling you must have been fuelling they must have been fuelling

Negation

Simple form	V-ing form
I must not fuel you must not fuel he must not fuel we must not fuel you must not fuel they must not fuel	I must not be fuelling you must not be fuelling he must not be fuelling we must not be fuelling you must not be fuelling they must not be fuelling
Perfect	V-ing perfect
I must not have fuelled you must not have fuelled he must not have fuelled we must not have fuelled you must not have fuelled they must not have fuelled	I must not have been fuelling you must not have been fuelling he must not have been fuelling we must not have been fuelling you must not have been fuelling they must not have been fuelling

Interrogative form

Simple form	V-ing form
must I fuel? must you fuel? must he fuel? must we fuel? must you fuel? must they fuel?	must I be fuelling? must you be fuelling? must he be fuelling? must we be fuelling? must you be fuelling? must they be fuelling?
Perfect	V-ing perfect
must I have fuelled? must you have fuelled? must he have fuelled? must we have fuelled? must you have fuelled? must they have fuelled?	must I have been fuelling? must you have been fuelling? must he have been fuelling? must we have been fuelling? must you have been fuelling? must they have been fuelling?

Interro-negative form

Simple form	V-ing form
must I not fuel? must you not fuel? must he not fuel? must we not fuel? must you not fuel? must they not fuel?	must I not be fuelling? must you not be fuelling? must he not be fuelling? must we not be fuelling? must you not be fuelling? must they not be fuelling?
Perfect	V-ing perfect
must I not have fuelled? must you not have fuelled? must he not have fuelled? must we not have fuelled? must you not have fuelled? must they not have fuelled?	must I not have been fuelling? must you not have been fuelling? must he not have been fuelling? must we not have been fuelling? must you not have been fuelling? must they not have been fuelling?