must fax
Regular verb: fax - faxed- faxed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must fax
you must fax
she must fax
we must fax
you must fax
they must fax 	I must be faxing
you must be faxing
she must be faxing
we must be faxing
you must be faxing
they must be faxing	I must have faxed
you must have faxed
she must have faxed
we must have faxed
you must have faxed
they must have faxed	I must have been faxing
you must have been faxing
she must have been faxing
we must have been faxing
you must have been faxing
they must have been faxing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't fax
you mustn't fax
she mustn't fax
we mustn't fax
you mustn't fax
they mustn't fax 	I mustn't be faxing
you mustn't be faxing
she mustn't be faxing
we mustn't be faxing
you mustn't be faxing
they mustn't be faxing	I mustn't have faxed
you mustn't have faxed
she mustn't have faxed
we mustn't have faxed
you mustn't have faxed
they mustn't have faxed	I mustn't have been faxing
you mustn't have been faxing
she mustn't have been faxing
we mustn't have been faxing
you mustn't have been faxing
they mustn't have been faxing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I fax?
must you fax?
must she fax?
must we fax?
must you fax?
must they fax? 	must I be faxing?
must you be faxing?
must she be faxing?
must we be faxing?
must you be faxing?
must they be faxing? 	must I have faxed?
must you have faxed?
must she have faxed?
must we have faxed?
must you have faxed?
must they have faxed? 	must I have been faxing?
must you have been faxing?
must she have been faxing?
must we have been faxing?
must you have been faxing?
must they have been faxing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I fax?
mustn't you fax?
mustn't she fax?
mustn't we fax?
mustn't you fax?
mustn't they fax? 	mustn't I be faxing?
mustn't you be faxing?
mustn't she be faxing?
mustn't we be faxing?
mustn't you be faxing?
mustn't they be faxing? 	mustn't I have faxed?
mustn't you have faxed?
mustn't she have faxed?
mustn't we have faxed?
mustn't you have faxed?
mustn't they have faxed? 	mustn't I have been faxing?
mustn't you have been faxing?
mustn't she have been faxing?
mustn't we have been faxing?
mustn't you have been faxing?
mustn't they have been faxing?