must spiff
Verbe régulier : spiff - spiffed- spiffed

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must spiff
you must spiff
he must spiff
we must spiff
you must spiff
they must spiff 	I must be spiffing
you must be spiffing
he must be spiffing
we must be spiffing
you must be spiffing
they must be spiffing	I must have spiffed
you must have spiffed
he must have spiffed
we must have spiffed
you must have spiffed
they must have spiffed	I must have been spiffing
you must have been spiffing
he must have been spiffing
we must have been spiffing
you must have been spiffing
they must have been spiffing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not spiff
you must not spiff
he must not spiff
we must not spiff
you must not spiff
they must not spiff 	I must not be spiffing
you must not be spiffing
he must not be spiffing
we must not be spiffing
you must not be spiffing
they must not be spiffing	I must not have spiffed
you must not have spiffed
he must not have spiffed
we must not have spiffed
you must not have spiffed
they must not have spiffed	I must not have been spiffing
you must not have been spiffing
he must not have been spiffing
we must not have been spiffing
you must not have been spiffing
they must not have been spiffing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I spiff?
must you spiff?
must he spiff?
must we spiff?
must you spiff?
must they spiff? 	must I be spiffing?
must you be spiffing?
must he be spiffing?
must we be spiffing?
must you be spiffing?
must they be spiffing? 	must I have spiffed?
must you have spiffed?
must he have spiffed?
must we have spiffed?
must you have spiffed?
must they have spiffed? 	must I have been spiffing?
must you have been spiffing?
must he have been spiffing?
must we have been spiffing?
must you have been spiffing?
must they have been spiffing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not spiff?
must you not spiff?
must he not spiff?
must we not spiff?
must you not spiff?
must they not spiff? 	must I not be spiffing?
must you not be spiffing?
must he not be spiffing?
must we not be spiffing?
must you not be spiffing?
must they not be spiffing? 	must I not have spiffed?
must you not have spiffed?
must he not have spiffed?
must we not have spiffed?
must you not have spiffed?
must they not have spiffed? 	must I not have been spiffing?
must you not have been spiffing?
must he not have been spiffing?
must we not have been spiffing?
must you not have been spiffing?
must they not have been spiffing?