must frown
Verbe régulier : frown - frowned- frowned
Traduction française : froncer les sourcils - se renfrogner 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must frown
you must frown
she must frown
we must frown
you must frown
they must frown 	I must be frowning
you must be frowning
she must be frowning
we must be frowning
you must be frowning
they must be frowning	I must have frowned
you must have frowned
she must have frowned
we must have frowned
you must have frowned
they must have frowned	I must have been frowning
you must have been frowning
she must have been frowning
we must have been frowning
you must have been frowning
they must have been frowning	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't frown
you mustn't frown
she mustn't frown
we mustn't frown
you mustn't frown
they mustn't frown 	I mustn't be frowning
you mustn't be frowning
she mustn't be frowning
we mustn't be frowning
you mustn't be frowning
they mustn't be frowning	I mustn't have frowned
you mustn't have frowned
she mustn't have frowned
we mustn't have frowned
you mustn't have frowned
they mustn't have frowned	I mustn't have been frowning
you mustn't have been frowning
she mustn't have been frowning
we mustn't have been frowning
you mustn't have been frowning
they mustn't have been frowning	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I frown?
must you frown?
must she frown?
must we frown?
must you frown?
must they frown? 	must I be frowning?
must you be frowning?
must she be frowning?
must we be frowning?
must you be frowning?
must they be frowning? 	must I have frowned?
must you have frowned?
must she have frowned?
must we have frowned?
must you have frowned?
must they have frowned? 	must I have been frowning?
must you have been frowning?
must she have been frowning?
must we have been frowning?
must you have been frowning?
must they have been frowning? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I frown?
mustn't you frown?
mustn't she frown?
mustn't we frown?
mustn't you frown?
mustn't they frown? 	mustn't I be frowning?
mustn't you be frowning?
mustn't she be frowning?
mustn't we be frowning?
mustn't you be frowning?
mustn't they be frowning? 	mustn't I have frowned?
mustn't you have frowned?
mustn't she have frowned?
mustn't we have frowned?
mustn't you have frowned?
mustn't they have frowned? 	mustn't I have been frowning?
mustn't you have been frowning?
mustn't she have been frowning?
mustn't we have been frowning?
mustn't you have been frowning?
mustn't they have been frowning?