must trill
Verbo regular: trill - trilled- trilled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must trill
you must trill
he must trill
we must trill
you must trill
they must trill 	I must be trilling
you must be trilling
he must be trilling
we must be trilling
you must be trilling
they must be trilling	I must have trilled
you must have trilled
he must have trilled
we must have trilled
you must have trilled
they must have trilled	I must have been trilling
you must have been trilling
he must have been trilling
we must have been trilling
you must have been trilling
they must have been trilling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not trill
you must not trill
he must not trill
we must not trill
you must not trill
they must not trill 	I must not be trilling
you must not be trilling
he must not be trilling
we must not be trilling
you must not be trilling
they must not be trilling	I must not have trilled
you must not have trilled
he must not have trilled
we must not have trilled
you must not have trilled
they must not have trilled	I must not have been trilling
you must not have been trilling
he must not have been trilling
we must not have been trilling
you must not have been trilling
they must not have been trilling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I trill?
must you trill?
must he trill?
must we trill?
must you trill?
must they trill? 	must I be trilling?
must you be trilling?
must he be trilling?
must we be trilling?
must you be trilling?
must they be trilling? 	must I have trilled?
must you have trilled?
must he have trilled?
must we have trilled?
must you have trilled?
must they have trilled? 	must I have been trilling?
must you have been trilling?
must he have been trilling?
must we have been trilling?
must you have been trilling?
must they have been trilling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not trill?
must you not trill?
must he not trill?
must we not trill?
must you not trill?
must they not trill? 	must I not be trilling?
must you not be trilling?
must he not be trilling?
must we not be trilling?
must you not be trilling?
must they not be trilling? 	must I not have trilled?
must you not have trilled?
must he not have trilled?
must we not have trilled?
must you not have trilled?
must they not have trilled? 	must I not have been trilling?
must you not have been trilling?
must he not have been trilling?
must we not have been trilling?
must you not have been trilling?
must they not have been trilling?