must tongue
Regular verb: tongue - tongued- tongued

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must tongue
you must tongue
he must tongue
we must tongue
you must tongue
they must tongue 	I must be tonguing
you must be tonguing
he must be tonguing
we must be tonguing
you must be tonguing
they must be tonguing	I must have tongued
you must have tongued
he must have tongued
we must have tongued
you must have tongued
they must have tongued	I must have been tonguing
you must have been tonguing
he must have been tonguing
we must have been tonguing
you must have been tonguing
they must have been tonguing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't tongue
you mustn't tongue
he mustn't tongue
we mustn't tongue
you mustn't tongue
they mustn't tongue 	I mustn't be tonguing
you mustn't be tonguing
he mustn't be tonguing
we mustn't be tonguing
you mustn't be tonguing
they mustn't be tonguing	I mustn't have tongued
you mustn't have tongued
he mustn't have tongued
we mustn't have tongued
you mustn't have tongued
they mustn't have tongued	I mustn't have been tonguing
you mustn't have been tonguing
he mustn't have been tonguing
we mustn't have been tonguing
you mustn't have been tonguing
they mustn't have been tonguing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I tongue?
must you tongue?
must he tongue?
must we tongue?
must you tongue?
must they tongue? 	must I be tonguing?
must you be tonguing?
must he be tonguing?
must we be tonguing?
must you be tonguing?
must they be tonguing? 	must I have tongued?
must you have tongued?
must he have tongued?
must we have tongued?
must you have tongued?
must they have tongued? 	must I have been tonguing?
must you have been tonguing?
must he have been tonguing?
must we have been tonguing?
must you have been tonguing?
must they have been tonguing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I tongue?
mustn't you tongue?
mustn't he tongue?
mustn't we tongue?
mustn't you tongue?
mustn't they tongue? 	mustn't I be tonguing?
mustn't you be tonguing?
mustn't he be tonguing?
mustn't we be tonguing?
mustn't you be tonguing?
mustn't they be tonguing? 	mustn't I have tongued?
mustn't you have tongued?
mustn't he have tongued?
mustn't we have tongued?
mustn't you have tongued?
mustn't they have tongued? 	mustn't I have been tonguing?
mustn't you have been tonguing?
mustn't he have been tonguing?
mustn't we have been tonguing?
mustn't you have been tonguing?
mustn't they have been tonguing?