I must halter you must halter he must halter we must halter you must halter they must halter
V-ing form
I must be haltering you must be haltering he must be haltering we must be haltering you must be haltering they must be haltering
Perfect
I must have haltered you must have haltered he must have haltered we must have haltered you must have haltered they must have haltered
V-ing perfect
I must have been haltering you must have been haltering he must have been haltering we must have been haltering you must have been haltering they must have been haltering
Negation
Simple form
I must not halter you must not halter he must not halter we must not halter you must not halter they must not halter
V-ing form
I must not be haltering you must not be haltering he must not be haltering we must not be haltering you must not be haltering they must not be haltering
Perfect
I must not have haltered you must not have haltered he must not have haltered we must not have haltered you must not have haltered they must not have haltered
V-ing perfect
I must not have been haltering you must not have been haltering he must not have been haltering we must not have been haltering you must not have been haltering they must not have been haltering
Interrogative form
Simple form
must I halter? must you halter? must he halter? must we halter? must you halter? must they halter?
V-ing form
must I be haltering? must you be haltering? must he be haltering? must we be haltering? must you be haltering? must they be haltering?
Perfect
must I have haltered? must you have haltered? must he have haltered? must we have haltered? must you have haltered? must they have haltered?
V-ing perfect
must I have been haltering? must you have been haltering? must he have been haltering? must we have been haltering? must you have been haltering? must they have been haltering?
Interro-negative form
Simple form
must I not halter? must you not halter? must he not halter? must we not halter? must you not halter? must they not halter?
V-ing form
must I not be haltering? must you not be haltering? must he not be haltering? must we not be haltering? must you not be haltering? must they not be haltering?
Perfect
must I not have haltered? must you not have haltered? must he not have haltered? must we not have haltered? must you not have haltered? must they not have haltered?
V-ing perfect
must I not have been haltering? must you not have been haltering? must he not have been haltering? must we not have been haltering? must you not have been haltering? must they not have been haltering?