I must stake you must stake he must stake we must stake you must stake they must stake
V-ing form
I must be staking you must be staking he must be staking we must be staking you must be staking they must be staking
Perfect
I must have staked you must have staked he 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 he must have been staking we must have been staking you must have been staking they must have been staking
Negation
Simple form
I mustn't stake you mustn't stake he mustn't stake we mustn't stake you mustn't stake they mustn't stake
V-ing form
I mustn't be staking you mustn't be staking he mustn't be staking we mustn't be staking you mustn't be staking they mustn't be staking
Perfect
I mustn't have staked you mustn't have staked he mustn't have staked we mustn't have staked you mustn't have staked they mustn't have staked
V-ing perfect
I mustn't have been staking you mustn't have been staking he mustn't have been staking we mustn't have been staking you mustn't have been staking they mustn't have been staking
Interrogative form
Simple form
must I stake? must you stake? must he stake? must we stake? must you stake? must they stake?
V-ing form
must I be staking? must you be staking? must he be staking? must we be staking? must you be staking? must they be staking?
Perfect
must I have staked? must you have staked? must he 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 he have been staking? must we have been staking? must you have been staking? must they have been staking?
Interro-negative form
Simple form
mustn't I stake? mustn't you stake? mustn't he stake? mustn't we stake? mustn't you stake? mustn't they stake?
V-ing form
mustn't I be staking? mustn't you be staking? mustn't he be staking? mustn't we be staking? mustn't you be staking? mustn't they be staking?
Perfect
mustn't I have staked? mustn't you have staked? mustn't he have staked? mustn't we have staked? mustn't you have staked? mustn't they have staked?
V-ing perfect
mustn't I have been staking? mustn't you have been staking? mustn't he have been staking? mustn't we have been staking? mustn't you have been staking? mustn't they have been staking?