must prefer
Verbo regular: prefer - preferred- preferred

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must prefer
you must prefer
he must prefer
we must prefer
you must prefer
they must prefer 	I must be preferring
you must be preferring
he must be preferring
we must be preferring
you must be preferring
they must be preferring	I must have preferred
you must have preferred
he must have preferred
we must have preferred
you must have preferred
they must have preferred	I must have been preferring
you must have been preferring
he must have been preferring
we must have been preferring
you must have been preferring
they must have been preferring	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not prefer
you must not prefer
he must not prefer
we must not prefer
you must not prefer
they must not prefer 	I must not be preferring
you must not be preferring
he must not be preferring
we must not be preferring
you must not be preferring
they must not be preferring	I must not have preferred
you must not have preferred
he must not have preferred
we must not have preferred
you must not have preferred
they must not have preferred	I must not have been preferring
you must not have been preferring
he must not have been preferring
we must not have been preferring
you must not have been preferring
they must not have been preferring	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I prefer?
must you prefer?
must he prefer?
must we prefer?
must you prefer?
must they prefer? 	must I be preferring?
must you be preferring?
must he be preferring?
must we be preferring?
must you be preferring?
must they be preferring? 	must I have preferred?
must you have preferred?
must he have preferred?
must we have preferred?
must you have preferred?
must they have preferred? 	must I have been preferring?
must you have been preferring?
must he have been preferring?
must we have been preferring?
must you have been preferring?
must they have been preferring? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not prefer?
must you not prefer?
must he not prefer?
must we not prefer?
must you not prefer?
must they not prefer? 	must I not be preferring?
must you not be preferring?
must he not be preferring?
must we not be preferring?
must you not be preferring?
must they not be preferring? 	must I not have preferred?
must you not have preferred?
must he not have preferred?
must we not have preferred?
must you not have preferred?
must they not have preferred? 	must I not have been preferring?
must you not have been preferring?
must he not have been preferring?
must we not have been preferring?
must you not have been preferring?
must they not have been preferring?