I must halt you must halt she must halt we must halt you must halt they must halt
V-ing form
I must be halting you must be halting she must be halting we must be halting you must be halting they must be halting
Perfect
I must have halted you must have halted she 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 she must have been halting we must have been halting you must have been halting they must have been halting
Negation
Simple form
I must not halt you must not halt she must not halt we must not halt you must not halt they must not halt
V-ing form
I must not be halting you must not be halting she must not be halting we must not be halting you must not be halting they must not be halting
Perfect
I must not have halted you must not have halted she must not have halted we must not have halted you must not have halted they must not have halted
V-ing perfect
I must not have been halting you must not have been halting she must not have been halting we must not have been halting you must not have been halting they must not have been halting
Interrogative form
Simple form
must I halt? must you halt? must she halt? must we halt? must you halt? must they halt?
V-ing form
must I be halting? must you be halting? must she be halting? must we be halting? must you be halting? must they be halting?
Perfect
must I have halted? must you have halted? must she 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 she have been halting? must we have been halting? must you have been halting? must they have been halting?
Interro-negative form
Simple form
must I not halt? must you not halt? must she not halt? must we not halt? must you not halt? must they not halt?
V-ing form
must I not be halting? must you not be halting? must she not be halting? must we not be halting? must you not be halting? must they not be halting?
Perfect
must I not have halted? must you not have halted? must she not have halted? must we not have halted? must you not have halted? must they not have halted?
V-ing perfect
must I not have been halting? must you not have been halting? must she not have been halting? must we not have been halting? must you not have been halting? must they not have been halting?