must derive
Verbo regolare: derive - derived- derived

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must derive
you must derive
she must derive
we must derive
you must derive
they must derive 	I must be deriving
you must be deriving
she must be deriving
we must be deriving
you must be deriving
they must be deriving	I must have derived
you must have derived
she must have derived
we must have derived
you must have derived
they must have derived	I must have been deriving
you must have been deriving
she must have been deriving
we must have been deriving
you must have been deriving
they must have been deriving	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not derive
you must not derive
she must not derive
we must not derive
you must not derive
they must not derive 	I must not be deriving
you must not be deriving
she must not be deriving
we must not be deriving
you must not be deriving
they must not be deriving	I must not have derived
you must not have derived
she must not have derived
we must not have derived
you must not have derived
they must not have derived	I must not have been deriving
you must not have been deriving
she must not have been deriving
we must not have been deriving
you must not have been deriving
they must not have been deriving	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I derive?
must you derive?
must she derive?
must we derive?
must you derive?
must they derive? 	must I be deriving?
must you be deriving?
must she be deriving?
must we be deriving?
must you be deriving?
must they be deriving? 	must I have derived?
must you have derived?
must she have derived?
must we have derived?
must you have derived?
must they have derived? 	must I have been deriving?
must you have been deriving?
must she have been deriving?
must we have been deriving?
must you have been deriving?
must they have been deriving? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not derive?
must you not derive?
must she not derive?
must we not derive?
must you not derive?
must they not derive? 	must I not be deriving?
must you not be deriving?
must she not be deriving?
must we not be deriving?
must you not be deriving?
must they not be deriving? 	must I not have derived?
must you not have derived?
must she not have derived?
must we not have derived?
must you not have derived?
must they not have derived? 	must I not have been deriving?
must you not have been deriving?
must she not have been deriving?
must we not have been deriving?
must you not have been deriving?
must they not have been deriving?