must falter
Regular verb: falter - faltered- faltered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must falter
you must falter
he must falter
we must falter
you must falter
they must falter 	I must be faltering
you must be faltering
he must be faltering
we must be faltering
you must be faltering
they must be faltering	I must have faltered
you must have faltered
he must have faltered
we must have faltered
you must have faltered
they must have faltered	I must have been faltering
you must have been faltering
he must have been faltering
we must have been faltering
you must have been faltering
they must have been faltering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not falter
you must not falter
he must not falter
we must not falter
you must not falter
they must not falter 	I must not be faltering
you must not be faltering
he must not be faltering
we must not be faltering
you must not be faltering
they must not be faltering	I must not have faltered
you must not have faltered
he must not have faltered
we must not have faltered
you must not have faltered
they must not have faltered	I must not have been faltering
you must not have been faltering
he must not have been faltering
we must not have been faltering
you must not have been faltering
they must not have been faltering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I falter?
must you falter?
must he falter?
must we falter?
must you falter?
must they falter? 	must I be faltering?
must you be faltering?
must he be faltering?
must we be faltering?
must you be faltering?
must they be faltering? 	must I have faltered?
must you have faltered?
must he have faltered?
must we have faltered?
must you have faltered?
must they have faltered? 	must I have been faltering?
must you have been faltering?
must he have been faltering?
must we have been faltering?
must you have been faltering?
must they have been faltering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not falter?
must you not falter?
must he not falter?
must we not falter?
must you not falter?
must they not falter? 	must I not be faltering?
must you not be faltering?
must he not be faltering?
must we not be faltering?
must you not be faltering?
must they not be faltering? 	must I not have faltered?
must you not have faltered?
must he not have faltered?
must we not have faltered?
must you not have faltered?
must they not have faltered? 	must I not have been faltering?
must you not have been faltering?
must he not have been faltering?
must we not have been faltering?
must you not have been faltering?
must they not have been faltering?