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
he must smile
we must smile
you must smile
they must smile 	I must be smiling
you must be smiling
he must be smiling
we must be smiling
you must be smiling
they must be smiling	I must have smiled
you must have smiled
he 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
he 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 must not smile
you must not smile
he must not smile
we must not smile
you must not smile
they must not smile 	I must not be smiling
you must not be smiling
he must not be smiling
we must not be smiling
you must not be smiling
they must not be smiling	I must not have smiled
you must not have smiled
he must not have smiled
we must not have smiled
you must not have smiled
they must not have smiled	I must not have been smiling
you must not have been smiling
he must not have been smiling
we must not have been smiling
you must not have been smiling
they must not have been smiling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I smile?
must you smile?
must he smile?
must we smile?
must you smile?
must they smile? 	must I be smiling?
must you be smiling?
must he be smiling?
must we be smiling?
must you be smiling?
must they be smiling? 	must I have smiled?
must you have smiled?
must he 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 he 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 	
must I not smile?
must you not smile?
must he not smile?
must we not smile?
must you not smile?
must they not smile? 	must I not be smiling?
must you not be smiling?
must he not be smiling?
must we not be smiling?
must you not be smiling?
must they not be smiling? 	must I not have smiled?
must you not have smiled?
must he not have smiled?
must we not have smiled?
must you not have smiled?
must they not have smiled? 	must I not have been smiling?
must you not have been smiling?
must he not have been smiling?
must we not have been smiling?
must you not have been smiling?
must they not have been smiling?