could err
Verbe régulier : err - erred- erred
Traduction française : se tromper - pécher 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could err
you could err
he could err
we could err
you could err
they could err 	I could be erring
you could be erring
he could be erring
we could be erring
you could be erring
they could be erring	I could have erred
you could have erred
he 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
he could have been erring
we could have been erring
you could have been erring
they could have been erring	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not err
you could not err
he could not err
we could not err
you could not err
they could not err 	I could not be erring
you could not be erring
he could not be erring
we could not be erring
you could not be erring
they could not be erring	I could not have erred
you could not have erred
he could not have erred
we could not have erred
you could not have erred
they could not have erred	I could not have been erring
you could not have been erring
he could not have been erring
we could not have been erring
you could not have been erring
they could not have been erring	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I err?
could you err?
could he err?
could we err?
could you err?
could they err? 	could I be erring?
could you be erring?
could he be erring?
could we be erring?
could you be erring?
could they be erring? 	could I have erred?
could you have erred?
could he 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 he have been erring?
could we have been erring?
could you have been erring?
could they have been erring? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not err?
could you not err?
could he not err?
could we not err?
could you not err?
could they not err? 	could I not be erring?
could you not be erring?
could he not be erring?
could we not be erring?
could you not be erring?
could they not be erring? 	could I not have erred?
could you not have erred?
could he not have erred?
could we not have erred?
could you not have erred?
could they not have erred? 	could I not have been erring?
could you not have been erring?
could he not have been erring?
could we not have been erring?
could you not have been erring?
could they not have been erring?