English verb conjugation
MUST GRIND

Irregular verb: grind - ground - ground

Affirmation

Simple form	V-ing form
I must grind you must grind he must grind we must grind you must grind they must grind	I must be grinding you must be grinding he must be grinding we must be grinding you must be grinding they must be grinding
Perfect	V-ing perfect
I must have ground you must have ground he must have ground we must have ground you must have ground they must have ground	I must have been grinding you must have been grinding he must have been grinding we must have been grinding you must have been grinding they must have been grinding

Negation

Simple form	V-ing form
I must not grind you must not grind he must not grind we must not grind you must not grind they must not grind	I must not be grinding you must not be grinding he must not be grinding we must not be grinding you must not be grinding they must not be grinding
Perfect	V-ing perfect
I must not have ground you must not have ground he must not have ground we must not have ground you must not have ground they must not have ground	I must not have been grinding you must not have been grinding he must not have been grinding we must not have been grinding you must not have been grinding they must not have been grinding

Interrogative form

Simple form	V-ing form
must I grind? must you grind? must he grind? must we grind? must you grind? must they grind?	must I be grinding? must you be grinding? must he be grinding? must we be grinding? must you be grinding? must they be grinding?
Perfect	V-ing perfect
must I have ground? must you have ground? must he have ground? must we have ground? must you have ground? must they have ground?	must I have been grinding? must you have been grinding? must he have been grinding? must we have been grinding? must you have been grinding? must they have been grinding?

Interro-negative form

Simple form	V-ing form
must I not grind? must you not grind? must he not grind? must we not grind? must you not grind? must they not grind?	must I not be grinding? must you not be grinding? must he not be grinding? must we not be grinding? must you not be grinding? must they not be grinding?
Perfect	V-ing perfect
must I not have ground? must you not have ground? must he not have ground? must we not have ground? must you not have ground? must they not have ground?	must I not have been grinding? must you not have been grinding? must he not have been grinding? must we not have been grinding? must you not have been grinding? must they not have been grinding?