laravel separate Login Errors

when we use laravel after enter email and password and when our email or password pr both of them are wrong, the laravel tell us just one message for all probably situations , i just want to separate the errors , e.g your password is wrong or your email not found or we cannot find this user etc. i just customize the auth.php file in lang folder and set this :

'failed' => 'Login Failed!!',

i want to add more condition for my login errors

please help me to do this task

thanks for your helping :)

via Chebli Mohamed