must puff
Verbo regolare: puff - puffed- puffed

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must puff
you must puff
he must puff
we must puff
you must puff
they must puff 	I must be puffing
you must be puffing
he must be puffing
we must be puffing
you must be puffing
they must be puffing	I must have puffed
you must have puffed
he must have puffed
we must have puffed
you must have puffed
they must have puffed	I must have been puffing
you must have been puffing
he must have been puffing
we must have been puffing
you must have been puffing
they must have been puffing	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not puff
you must not puff
he must not puff
we must not puff
you must not puff
they must not puff 	I must not be puffing
you must not be puffing
he must not be puffing
we must not be puffing
you must not be puffing
they must not be puffing	I must not have puffed
you must not have puffed
he must not have puffed
we must not have puffed
you must not have puffed
they must not have puffed	I must not have been puffing
you must not have been puffing
he must not have been puffing
we must not have been puffing
you must not have been puffing
they must not have been puffing	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I puff?
must you puff?
must he puff?
must we puff?
must you puff?
must they puff? 	must I be puffing?
must you be puffing?
must he be puffing?
must we be puffing?
must you be puffing?
must they be puffing? 	must I have puffed?
must you have puffed?
must he have puffed?
must we have puffed?
must you have puffed?
must they have puffed? 	must I have been puffing?
must you have been puffing?
must he have been puffing?
must we have been puffing?
must you have been puffing?
must they have been puffing? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not puff?
must you not puff?
must he not puff?
must we not puff?
must you not puff?
must they not puff? 	must I not be puffing?
must you not be puffing?
must he not be puffing?
must we not be puffing?
must you not be puffing?
must they not be puffing? 	must I not have puffed?
must you not have puffed?
must he not have puffed?
must we not have puffed?
must you not have puffed?
must they not have puffed? 	must I not have been puffing?
must you not have been puffing?
must he not have been puffing?
must we not have been puffing?
must you not have been puffing?
must they not have been puffing?