must tauten
Regular verb: tauten - tautened- tautened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must tauten
you must tauten
he must tauten
we must tauten
you must tauten
they must tauten 	I must be tautening
you must be tautening
he must be tautening
we must be tautening
you must be tautening
they must be tautening	I must have tautened
you must have tautened
he must have tautened
we must have tautened
you must have tautened
they must have tautened	I must have been tautening
you must have been tautening
he must have been tautening
we must have been tautening
you must have been tautening
they must have been tautening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't tauten
you mustn't tauten
he mustn't tauten
we mustn't tauten
you mustn't tauten
they mustn't tauten 	I mustn't be tautening
you mustn't be tautening
he mustn't be tautening
we mustn't be tautening
you mustn't be tautening
they mustn't be tautening	I mustn't have tautened
you mustn't have tautened
he mustn't have tautened
we mustn't have tautened
you mustn't have tautened
they mustn't have tautened	I mustn't have been tautening
you mustn't have been tautening
he mustn't have been tautening
we mustn't have been tautening
you mustn't have been tautening
they mustn't have been tautening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I tauten?
must you tauten?
must he tauten?
must we tauten?
must you tauten?
must they tauten? 	must I be tautening?
must you be tautening?
must he be tautening?
must we be tautening?
must you be tautening?
must they be tautening? 	must I have tautened?
must you have tautened?
must he have tautened?
must we have tautened?
must you have tautened?
must they have tautened? 	must I have been tautening?
must you have been tautening?
must he have been tautening?
must we have been tautening?
must you have been tautening?
must they have been tautening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I tauten?
mustn't you tauten?
mustn't he tauten?
mustn't we tauten?
mustn't you tauten?
mustn't they tauten? 	mustn't I be tautening?
mustn't you be tautening?
mustn't he be tautening?
mustn't we be tautening?
mustn't you be tautening?
mustn't they be tautening? 	mustn't I have tautened?
mustn't you have tautened?
mustn't he have tautened?
mustn't we have tautened?
mustn't you have tautened?
mustn't they have tautened? 	mustn't I have been tautening?
mustn't you have been tautening?
mustn't he have been tautening?
mustn't we have been tautening?
mustn't you have been tautening?
mustn't they have been tautening?