must err
Verbo regolare: err - erred- erred

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must err
you must err
she must err
we must err
you must err
they must err 	I must be erring
you must be erring
she must be erring
we must be erring
you must be erring
they must be erring	I must have erred
you must have erred
she must have erred
we must have erred
you must have erred
they must have erred	I must have been erring
you must have been erring
she must have been erring
we must have been erring
you must have been erring
they must have been erring	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must not err
you must not err
she must not err
we must not err
you must not err
they must not err 	I must not be erring
you must not be erring
she must not be erring
we must not be erring
you must not be erring
they must not be erring	I must not have erred
you must not have erred
she must not have erred
we must not have erred
you must not have erred
they must not have erred	I must not have been erring
you must not have been erring
she must not have been erring
we must not have been erring
you must not have been erring
they must not have been erring	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I err?
must you err?
must she err?
must we err?
must you err?
must they err? 	must I be erring?
must you be erring?
must she be erring?
must we be erring?
must you be erring?
must they be erring? 	must I have erred?
must you have erred?
must she have erred?
must we have erred?
must you have erred?
must they have erred? 	must I have been erring?
must you have been erring?
must she have been erring?
must we have been erring?
must you have been erring?
must they have been erring? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I not err?
must you not err?
must she not err?
must we not err?
must you not err?
must they not err? 	must I not be erring?
must you not be erring?
must she not be erring?
must we not be erring?
must you not be erring?
must they not be erring? 	must I not have erred?
must you not have erred?
must she not have erred?
must we not have erred?
must you not have erred?
must they not have erred? 	must I not have been erring?
must you not have been erring?
must she not have been erring?
must we not have been erring?
must you not have been erring?
must they not have been erring?