English verb conjugation
MUST GRUBSTAKE

Regular verb: grubstake - grubstaked - grubstaked

Affirmation

Simple form	V-ing form
I must grubstake you must grubstake he must grubstake we must grubstake you must grubstake they must grubstake	I must be grubstaking you must be grubstaking he must be grubstaking we must be grubstaking you must be grubstaking they must be grubstaking
Perfect	V-ing perfect
I must have grubstaked you must have grubstaked he must have grubstaked we must have grubstaked you must have grubstaked they must have grubstaked	I must have been grubstaking you must have been grubstaking he must have been grubstaking we must have been grubstaking you must have been grubstaking they must have been grubstaking

Negation

Simple form	V-ing form
I must not grubstake you must not grubstake he must not grubstake we must not grubstake you must not grubstake they must not grubstake	I must not be grubstaking you must not be grubstaking he must not be grubstaking we must not be grubstaking you must not be grubstaking they must not be grubstaking
Perfect	V-ing perfect
I must not have grubstaked you must not have grubstaked he must not have grubstaked we must not have grubstaked you must not have grubstaked they must not have grubstaked	I must not have been grubstaking you must not have been grubstaking he must not have been grubstaking we must not have been grubstaking you must not have been grubstaking they must not have been grubstaking

Interrogative form

Simple form	V-ing form
must I grubstake? must you grubstake? must he grubstake? must we grubstake? must you grubstake? must they grubstake?	must I be grubstaking? must you be grubstaking? must he be grubstaking? must we be grubstaking? must you be grubstaking? must they be grubstaking?
Perfect	V-ing perfect
must I have grubstaked? must you have grubstaked? must he have grubstaked? must we have grubstaked? must you have grubstaked? must they have grubstaked?	must I have been grubstaking? must you have been grubstaking? must he have been grubstaking? must we have been grubstaking? must you have been grubstaking? must they have been grubstaking?

Interro-negative form

Simple form	V-ing form
must I not grubstake? must you not grubstake? must he not grubstake? must we not grubstake? must you not grubstake? must they not grubstake?	must I not be grubstaking? must you not be grubstaking? must he not be grubstaking? must we not be grubstaking? must you not be grubstaking? must they not be grubstaking?
Perfect	V-ing perfect
must I not have grubstaked? must you not have grubstaked? must he not have grubstaked? must we not have grubstaked? must you not have grubstaked? must they not have grubstaked?	must I not have been grubstaking? must you not have been grubstaking? must he not have been grubstaking? must we not have been grubstaking? must you not have been grubstaking? must they not have been grubstaking?