must smile
Verbo regular: smile - smiled- smiled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must smile
you must smile
she must smile
we must smile
you must smile
they must smile 	I must be smiling
you must be smiling
she must be smiling
we must be smiling
you must be smiling
they must be smiling	I must have smiled
you must have smiled
she must have smiled
we must have smiled
you must have smiled
they must have smiled	I must have been smiling
you must have been smiling
she must have been smiling
we must have been smiling
you must have been smiling
they must have been smiling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't smile
you mustn't smile
she mustn't smile
we mustn't smile
you mustn't smile
they mustn't smile 	I mustn't be smiling
you mustn't be smiling
she mustn't be smiling
we mustn't be smiling
you mustn't be smiling
they mustn't be smiling	I mustn't have smiled
you mustn't have smiled
she mustn't have smiled
we mustn't have smiled
you mustn't have smiled
they mustn't have smiled	I mustn't have been smiling
you mustn't have been smiling
she mustn't have been smiling
we mustn't have been smiling
you mustn't have been smiling
they mustn't have been smiling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I smile?
must you smile?
must she smile?
must we smile?
must you smile?
must they smile? 	must I be smiling?
must you be smiling?
must she be smiling?
must we be smiling?
must you be smiling?
must they be smiling? 	must I have smiled?
must you have smiled?
must she have smiled?
must we have smiled?
must you have smiled?
must they have smiled? 	must I have been smiling?
must you have been smiling?
must she have been smiling?
must we have been smiling?
must you have been smiling?
must they have been smiling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I smile?
mustn't you smile?
mustn't she smile?
mustn't we smile?
mustn't you smile?
mustn't they smile? 	mustn't I be smiling?
mustn't you be smiling?
mustn't she be smiling?
mustn't we be smiling?
mustn't you be smiling?
mustn't they be smiling? 	mustn't I have smiled?
mustn't you have smiled?
mustn't she have smiled?
mustn't we have smiled?
mustn't you have smiled?
mustn't they have smiled? 	mustn't I have been smiling?
mustn't you have been smiling?
mustn't she have been smiling?
mustn't we have been smiling?
mustn't you have been smiling?
mustn't they have been smiling?