English verb conjugation
MUST GRAVEL

Regular verb: gravel - gravelled - gravelled

Affirmation

Simple form	V-ing form
I must gravel you must gravel he must gravel we must gravel you must gravel they must gravel	I must be gravelling you must be gravelling he 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 he 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 he 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 mustn't gravel you mustn't gravel he mustn't gravel we mustn't gravel you mustn't gravel they mustn't gravel	I mustn't be gravelling you mustn't be gravelling he mustn't be gravelling we mustn't be gravelling you mustn't be gravelling they mustn't be gravelling
Perfect	V-ing perfect
I mustn't have gravelled you mustn't have gravelled he mustn't have gravelled we mustn't have gravelled you mustn't have gravelled they mustn't have gravelled	I mustn't have been gravelling you mustn't have been gravelling he mustn't have been gravelling we mustn't have been gravelling you mustn't have been gravelling they mustn't have been gravelling

Interrogative form

Simple form	V-ing form
must I gravel? must you gravel? must he gravel? must we gravel? must you gravel? must they gravel?	must I be gravelling? must you be gravelling? must he 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 he 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 he 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
mustn't I gravel? mustn't you gravel? mustn't he gravel? mustn't we gravel? mustn't you gravel? mustn't they gravel?	mustn't I be gravelling? mustn't you be gravelling? mustn't he be gravelling? mustn't we be gravelling? mustn't you be gravelling? mustn't they be gravelling?
Perfect	V-ing perfect
mustn't I have gravelled? mustn't you have gravelled? mustn't he have gravelled? mustn't we have gravelled? mustn't you have gravelled? mustn't they have gravelled?	mustn't I have been gravelling? mustn't you have been gravelling? mustn't he have been gravelling? mustn't we have been gravelling? mustn't you have been gravelling? mustn't they have been gravelling?