must telephone
Regular verb: telephone - telephoned- telephoned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must telephone
you must telephone
he must telephone
we must telephone
you must telephone
they must telephone 	I must be telephoning
you must be telephoning
he must be telephoning
we must be telephoning
you must be telephoning
they must be telephoning	I must have telephoned
you must have telephoned
he must have telephoned
we must have telephoned
you must have telephoned
they must have telephoned	I must have been telephoning
you must have been telephoning
he must have been telephoning
we must have been telephoning
you must have been telephoning
they must have been telephoning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't telephone
you mustn't telephone
he mustn't telephone
we mustn't telephone
you mustn't telephone
they mustn't telephone 	I mustn't be telephoning
you mustn't be telephoning
he mustn't be telephoning
we mustn't be telephoning
you mustn't be telephoning
they mustn't be telephoning	I mustn't have telephoned
you mustn't have telephoned
he mustn't have telephoned
we mustn't have telephoned
you mustn't have telephoned
they mustn't have telephoned	I mustn't have been telephoning
you mustn't have been telephoning
he mustn't have been telephoning
we mustn't have been telephoning
you mustn't have been telephoning
they mustn't have been telephoning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I telephone?
must you telephone?
must he telephone?
must we telephone?
must you telephone?
must they telephone? 	must I be telephoning?
must you be telephoning?
must he be telephoning?
must we be telephoning?
must you be telephoning?
must they be telephoning? 	must I have telephoned?
must you have telephoned?
must he have telephoned?
must we have telephoned?
must you have telephoned?
must they have telephoned? 	must I have been telephoning?
must you have been telephoning?
must he have been telephoning?
must we have been telephoning?
must you have been telephoning?
must they have been telephoning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I telephone?
mustn't you telephone?
mustn't he telephone?
mustn't we telephone?
mustn't you telephone?
mustn't they telephone? 	mustn't I be telephoning?
mustn't you be telephoning?
mustn't he be telephoning?
mustn't we be telephoning?
mustn't you be telephoning?
mustn't they be telephoning? 	mustn't I have telephoned?
mustn't you have telephoned?
mustn't he have telephoned?
mustn't we have telephoned?
mustn't you have telephoned?
mustn't they have telephoned? 	mustn't I have been telephoning?
mustn't you have been telephoning?
mustn't he have been telephoning?
mustn't we have been telephoning?
mustn't you have been telephoning?
mustn't they have been telephoning?