I must stake you must stake she must stake we must stake you must stake they must stake
V-ing form
I must be staking you must be staking she must be staking we must be staking you must be staking they must be staking
Perfect
I must have staked you must have staked she must have staked we must have staked you must have staked they must have staked
V-ing perfect
I must have been staking you must have been staking she must have been staking we must have been staking you must have been staking they must have been staking
Negation
Simple form
I must not stake you must not stake she must not stake we must not stake you must not stake they must not stake
V-ing form
I must not be staking you must not be staking she must not be staking we must not be staking you must not be staking they must not be staking
Perfect
I must not have staked you must not have staked she must not have staked we must not have staked you must not have staked they must not have staked
V-ing perfect
I must not have been staking you must not have been staking she must not have been staking we must not have been staking you must not have been staking they must not have been staking
Interrogative form
Simple form
must I stake? must you stake? must she stake? must we stake? must you stake? must they stake?
V-ing form
must I be staking? must you be staking? must she be staking? must we be staking? must you be staking? must they be staking?
Perfect
must I have staked? must you have staked? must she have staked? must we have staked? must you have staked? must they have staked?
V-ing perfect
must I have been staking? must you have been staking? must she have been staking? must we have been staking? must you have been staking? must they have been staking?
Interro-negative form
Simple form
must I not stake? must you not stake? must she not stake? must we not stake? must you not stake? must they not stake?
V-ing form
must I not be staking? must you not be staking? must she not be staking? must we not be staking? must you not be staking? must they not be staking?
Perfect
must I not have staked? must you not have staked? must she not have staked? must we not have staked? must you not have staked? must they not have staked?
V-ing perfect
must I not have been staking? must you not have been staking? must she not have been staking? must we not have been staking? must you not have been staking? must they not have been staking?