could err
Verbo regolare: err - erred- erred

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

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I couldn't err
you couldn't err
she couldn't err
we couldn't err
you couldn't err
they couldn't err 	I couldn't be erring
you couldn't be erring
she couldn't be erring
we couldn't be erring
you couldn't be erring
they couldn't be erring	I couldn't have erred
you couldn't have erred
she couldn't have erred
we couldn't have erred
you couldn't have erred
they couldn't have erred	I couldn't have been erring
you couldn't have been erring
she couldn't have been erring
we couldn't have been erring
you couldn't have been erring
they couldn't have been erring	

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

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