must befriend
Regular verb: befriend - befriended- befriended

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must befriend
you must befriend
she must befriend
we must befriend
you must befriend
they must befriend 	I must be befriending
you must be befriending
she must be befriending
we must be befriending
you must be befriending
they must be befriending	I must have befriended
you must have befriended
she must have befriended
we must have befriended
you must have befriended
they must have befriended	I must have been befriending
you must have been befriending
she must have been befriending
we must have been befriending
you must have been befriending
they must have been befriending	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't befriend
you mustn't befriend
she mustn't befriend
we mustn't befriend
you mustn't befriend
they mustn't befriend 	I mustn't be befriending
you mustn't be befriending
she mustn't be befriending
we mustn't be befriending
you mustn't be befriending
they mustn't be befriending	I mustn't have befriended
you mustn't have befriended
she mustn't have befriended
we mustn't have befriended
you mustn't have befriended
they mustn't have befriended	I mustn't have been befriending
you mustn't have been befriending
she mustn't have been befriending
we mustn't have been befriending
you mustn't have been befriending
they mustn't have been befriending	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I befriend?
must you befriend?
must she befriend?
must we befriend?
must you befriend?
must they befriend? 	must I be befriending?
must you be befriending?
must she be befriending?
must we be befriending?
must you be befriending?
must they be befriending? 	must I have befriended?
must you have befriended?
must she have befriended?
must we have befriended?
must you have befriended?
must they have befriended? 	must I have been befriending?
must you have been befriending?
must she have been befriending?
must we have been befriending?
must you have been befriending?
must they have been befriending? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I befriend?
mustn't you befriend?
mustn't she befriend?
mustn't we befriend?
mustn't you befriend?
mustn't they befriend? 	mustn't I be befriending?
mustn't you be befriending?
mustn't she be befriending?
mustn't we be befriending?
mustn't you be befriending?
mustn't they be befriending? 	mustn't I have befriended?
mustn't you have befriended?
mustn't she have befriended?
mustn't we have befriended?
mustn't you have befriended?
mustn't they have befriended? 	mustn't I have been befriending?
mustn't you have been befriending?
mustn't she have been befriending?
mustn't we have been befriending?
mustn't you have been befriending?
mustn't they have been befriending?