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