English verb conjugation
MUST GRAVE

Regular verb: grave - graved - graved

Affirmation

Simple form	V-ing form
I must grave you must grave he must grave we must grave you must grave they must grave	I must be graving you must be graving he must be graving we must be graving you must be graving they must be graving
Perfect	V-ing perfect
I must have graved you must have graved he must have graved we must have graved you must have graved they must have graved	I must have been graving you must have been graving he must have been graving we must have been graving you must have been graving they must have been graving

Negation

Simple form	V-ing form
I mustn't grave you mustn't grave he mustn't grave we mustn't grave you mustn't grave they mustn't grave	I mustn't be graving you mustn't be graving he mustn't be graving we mustn't be graving you mustn't be graving they mustn't be graving
Perfect	V-ing perfect
I mustn't have graved you mustn't have graved he mustn't have graved we mustn't have graved you mustn't have graved they mustn't have graved	I mustn't have been graving you mustn't have been graving he mustn't have been graving we mustn't have been graving you mustn't have been graving they mustn't have been graving

Interrogative form

Simple form	V-ing form
must I grave? must you grave? must he grave? must we grave? must you grave? must they grave?	must I be graving? must you be graving? must he be graving? must we be graving? must you be graving? must they be graving?
Perfect	V-ing perfect
must I have graved? must you have graved? must he have graved? must we have graved? must you have graved? must they have graved?	must I have been graving? must you have been graving? must he have been graving? must we have been graving? must you have been graving? must they have been graving?

Interro-negative form

Simple form	V-ing form
mustn't I grave? mustn't you grave? mustn't he grave? mustn't we grave? mustn't you grave? mustn't they grave?	mustn't I be graving? mustn't you be graving? mustn't he be graving? mustn't we be graving? mustn't you be graving? mustn't they be graving?
Perfect	V-ing perfect
mustn't I have graved? mustn't you have graved? mustn't he have graved? mustn't we have graved? mustn't you have graved? mustn't they have graved?	mustn't I have been graving? mustn't you have been graving? mustn't he have been graving? mustn't we have been graving? mustn't you have been graving? mustn't they have been graving?