must friend
Verbo regular: friend - friended- friended

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must friend
you must friend
she must friend
we must friend
you must friend
they must friend 	I must be friending
you must be friending
she must be friending
we must be friending
you must be friending
they must be friending	I must have friended
you must have friended
she must have friended
we must have friended
you must have friended
they must have friended	I must have been friending
you must have been friending
she must have been friending
we must have been friending
you must have been friending
they must have been friending	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't friend
you mustn't friend
she mustn't friend
we mustn't friend
you mustn't friend
they mustn't friend 	I mustn't be friending
you mustn't be friending
she mustn't be friending
we mustn't be friending
you mustn't be friending
they mustn't be friending	I mustn't have friended
you mustn't have friended
she mustn't have friended
we mustn't have friended
you mustn't have friended
they mustn't have friended	I mustn't have been friending
you mustn't have been friending
she mustn't have been friending
we mustn't have been friending
you mustn't have been friending
they mustn't have been friending	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I friend?
must you friend?
must she friend?
must we friend?
must you friend?
must they friend? 	must I be friending?
must you be friending?
must she be friending?
must we be friending?
must you be friending?
must they be friending? 	must I have friended?
must you have friended?
must she have friended?
must we have friended?
must you have friended?
must they have friended? 	must I have been friending?
must you have been friending?
must she have been friending?
must we have been friending?
must you have been friending?
must they have been friending? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I friend?
mustn't you friend?
mustn't she friend?
mustn't we friend?
mustn't you friend?
mustn't they friend? 	mustn't I be friending?
mustn't you be friending?
mustn't she be friending?
mustn't we be friending?
mustn't you be friending?
mustn't they be friending? 	mustn't I have friended?
mustn't you have friended?
mustn't she have friended?
mustn't we have friended?
mustn't you have friended?
mustn't they have friended? 	mustn't I have been friending?
mustn't you have been friending?
mustn't she have been friending?
mustn't we have been friending?
mustn't you have been friending?
mustn't they have been friending?