must practice
Verbo regular: practice - practiced- practiced

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must practice
you must practice
he must practice
we must practice
you must practice
they must practice 	I must be practicing
you must be practicing
he must be practicing
we must be practicing
you must be practicing
they must be practicing	I must have practiced
you must have practiced
he must have practiced
we must have practiced
you must have practiced
they must have practiced	I must have been practicing
you must have been practicing
he must have been practicing
we must have been practicing
you must have been practicing
they must have been practicing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't practice
you mustn't practice
he mustn't practice
we mustn't practice
you mustn't practice
they mustn't practice 	I mustn't be practicing
you mustn't be practicing
he mustn't be practicing
we mustn't be practicing
you mustn't be practicing
they mustn't be practicing	I mustn't have practiced
you mustn't have practiced
he mustn't have practiced
we mustn't have practiced
you mustn't have practiced
they mustn't have practiced	I mustn't have been practicing
you mustn't have been practicing
he mustn't have been practicing
we mustn't have been practicing
you mustn't have been practicing
they mustn't have been practicing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I practice?
must you practice?
must he practice?
must we practice?
must you practice?
must they practice? 	must I be practicing?
must you be practicing?
must he be practicing?
must we be practicing?
must you be practicing?
must they be practicing? 	must I have practiced?
must you have practiced?
must he have practiced?
must we have practiced?
must you have practiced?
must they have practiced? 	must I have been practicing?
must you have been practicing?
must he have been practicing?
must we have been practicing?
must you have been practicing?
must they have been practicing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I practice?
mustn't you practice?
mustn't he practice?
mustn't we practice?
mustn't you practice?
mustn't they practice? 	mustn't I be practicing?
mustn't you be practicing?
mustn't he be practicing?
mustn't we be practicing?
mustn't you be practicing?
mustn't they be practicing? 	mustn't I have practiced?
mustn't you have practiced?
mustn't he have practiced?
mustn't we have practiced?
mustn't you have practiced?
mustn't they have practiced? 	mustn't I have been practicing?
mustn't you have been practicing?
mustn't he have been practicing?
mustn't we have been practicing?
mustn't you have been practicing?
mustn't they have been practicing?