English verb conjugation
MUST GROUND

Regular verb: ground - grounded - grounded

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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