English verb conjugation
MUST GRAVEL

Regular verb: gravel - gravelled - gravelled

Affirmation

Simple form	V-ing form
I must gravel you must gravel she must gravel we must gravel you must gravel they must gravel	I must be gravelling you must be gravelling she must be gravelling we must be gravelling you must be gravelling they must be gravelling
Perfect	V-ing perfect
I must have gravelled you must have gravelled she must have gravelled we must have gravelled you must have gravelled they must have gravelled	I must have been gravelling you must have been gravelling she must have been gravelling we must have been gravelling you must have been gravelling they must have been gravelling

Negation

Simple form	V-ing form
I must not gravel you must not gravel she must not gravel we must not gravel you must not gravel they must not gravel	I must not be gravelling you must not be gravelling she must not be gravelling we must not be gravelling you must not be gravelling they must not be gravelling
Perfect	V-ing perfect
I must not have gravelled you must not have gravelled she must not have gravelled we must not have gravelled you must not have gravelled they must not have gravelled	I must not have been gravelling you must not have been gravelling she must not have been gravelling we must not have been gravelling you must not have been gravelling they must not have been gravelling

Interrogative form

Simple form	V-ing form
must I gravel? must you gravel? must she gravel? must we gravel? must you gravel? must they gravel?	must I be gravelling? must you be gravelling? must she be gravelling? must we be gravelling? must you be gravelling? must they be gravelling?
Perfect	V-ing perfect
must I have gravelled? must you have gravelled? must she have gravelled? must we have gravelled? must you have gravelled? must they have gravelled?	must I have been gravelling? must you have been gravelling? must she have been gravelling? must we have been gravelling? must you have been gravelling? must they have been gravelling?

Interro-negative form

Simple form	V-ing form
must I not gravel? must you not gravel? must she not gravel? must we not gravel? must you not gravel? must they not gravel?	must I not be gravelling? must you not be gravelling? must she not be gravelling? must we not be gravelling? must you not be gravelling? must they not be gravelling?
Perfect	V-ing perfect
must I not have gravelled? must you not have gravelled? must she not have gravelled? must we not have gravelled? must you not have gravelled? must they not have gravelled?	must I not have been gravelling? must you not have been gravelling? must she not have been gravelling? must we not have been gravelling? must you not have been gravelling? must they not have been gravelling?