must billow
Verbo regular: billow - billowed- billowed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must billow
you must billow
he must billow
we must billow
you must billow
they must billow 	I must be billowing
you must be billowing
he must be billowing
we must be billowing
you must be billowing
they must be billowing	I must have billowed
you must have billowed
he must have billowed
we must have billowed
you must have billowed
they must have billowed	I must have been billowing
you must have been billowing
he must have been billowing
we must have been billowing
you must have been billowing
they must have been billowing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not billow
you must not billow
he must not billow
we must not billow
you must not billow
they must not billow 	I must not be billowing
you must not be billowing
he must not be billowing
we must not be billowing
you must not be billowing
they must not be billowing	I must not have billowed
you must not have billowed
he must not have billowed
we must not have billowed
you must not have billowed
they must not have billowed	I must not have been billowing
you must not have been billowing
he must not have been billowing
we must not have been billowing
you must not have been billowing
they must not have been billowing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I billow?
must you billow?
must he billow?
must we billow?
must you billow?
must they billow? 	must I be billowing?
must you be billowing?
must he be billowing?
must we be billowing?
must you be billowing?
must they be billowing? 	must I have billowed?
must you have billowed?
must he have billowed?
must we have billowed?
must you have billowed?
must they have billowed? 	must I have been billowing?
must you have been billowing?
must he have been billowing?
must we have been billowing?
must you have been billowing?
must they have been billowing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not billow?
must you not billow?
must he not billow?
must we not billow?
must you not billow?
must they not billow? 	must I not be billowing?
must you not be billowing?
must he not be billowing?
must we not be billowing?
must you not be billowing?
must they not be billowing? 	must I not have billowed?
must you not have billowed?
must he not have billowed?
must we not have billowed?
must you not have billowed?
must they not have billowed? 	must I not have been billowing?
must you not have been billowing?
must he not have been billowing?
must we not have been billowing?
must you not have been billowing?
must they not have been billowing?