must fix
Regular verb: fix - fixed- fixed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must fix
you must fix
she must fix
we must fix
you must fix
they must fix 	I must be fixing
you must be fixing
she must be fixing
we must be fixing
you must be fixing
they must be fixing	I must have fixed
you must have fixed
she must have fixed
we must have fixed
you must have fixed
they must have fixed	I must have been fixing
you must have been fixing
she must have been fixing
we must have been fixing
you must have been fixing
they must have been fixing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't fix
you mustn't fix
she mustn't fix
we mustn't fix
you mustn't fix
they mustn't fix 	I mustn't be fixing
you mustn't be fixing
she mustn't be fixing
we mustn't be fixing
you mustn't be fixing
they mustn't be fixing	I mustn't have fixed
you mustn't have fixed
she mustn't have fixed
we mustn't have fixed
you mustn't have fixed
they mustn't have fixed	I mustn't have been fixing
you mustn't have been fixing
she mustn't have been fixing
we mustn't have been fixing
you mustn't have been fixing
they mustn't have been fixing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I fix?
must you fix?
must she fix?
must we fix?
must you fix?
must they fix? 	must I be fixing?
must you be fixing?
must she be fixing?
must we be fixing?
must you be fixing?
must they be fixing? 	must I have fixed?
must you have fixed?
must she have fixed?
must we have fixed?
must you have fixed?
must they have fixed? 	must I have been fixing?
must you have been fixing?
must she have been fixing?
must we have been fixing?
must you have been fixing?
must they have been fixing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I fix?
mustn't you fix?
mustn't she fix?
mustn't we fix?
mustn't you fix?
mustn't they fix? 	mustn't I be fixing?
mustn't you be fixing?
mustn't she be fixing?
mustn't we be fixing?
mustn't you be fixing?
mustn't they be fixing? 	mustn't I have fixed?
mustn't you have fixed?
mustn't she have fixed?
mustn't we have fixed?
mustn't you have fixed?
mustn't they have fixed? 	mustn't I have been fixing?
mustn't you have been fixing?
mustn't she have been fixing?
mustn't we have been fixing?
mustn't you have been fixing?
mustn't they have been fixing?