English verb conjugation
MUST GRUBSTAKE

Regular verb: grubstake - grubstaked - grubstaked

Affirmation

Simple form	V-ing form
I must grubstake you must grubstake she must grubstake we must grubstake you must grubstake they must grubstake	I must be grubstaking you must be grubstaking she 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 she 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 she 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 mustn't grubstake you mustn't grubstake she mustn't grubstake we mustn't grubstake you mustn't grubstake they mustn't grubstake	I mustn't be grubstaking you mustn't be grubstaking she mustn't be grubstaking we mustn't be grubstaking you mustn't be grubstaking they mustn't be grubstaking
Perfect	V-ing perfect
I mustn't have grubstaked you mustn't have grubstaked she mustn't have grubstaked we mustn't have grubstaked you mustn't have grubstaked they mustn't have grubstaked	I mustn't have been grubstaking you mustn't have been grubstaking she mustn't have been grubstaking we mustn't have been grubstaking you mustn't have been grubstaking they mustn't have been grubstaking

Interrogative form

Simple form	V-ing form
must I grubstake? must you grubstake? must she grubstake? must we grubstake? must you grubstake? must they grubstake?	must I be grubstaking? must you be grubstaking? must she 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 she 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 she 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
mustn't I grubstake? mustn't you grubstake? mustn't she grubstake? mustn't we grubstake? mustn't you grubstake? mustn't they grubstake?	mustn't I be grubstaking? mustn't you be grubstaking? mustn't she be grubstaking? mustn't we be grubstaking? mustn't you be grubstaking? mustn't they be grubstaking?
Perfect	V-ing perfect
mustn't I have grubstaked? mustn't you have grubstaked? mustn't she have grubstaked? mustn't we have grubstaked? mustn't you have grubstaked? mustn't they have grubstaked?	mustn't I have been grubstaking? mustn't you have been grubstaking? mustn't she have been grubstaking? mustn't we have been grubstaking? mustn't you have been grubstaking? mustn't they have been grubstaking?