Błędnie: We had an awful oral exam - the tape recorder was very low and we could not hear anything. Poprawnie: We had an awful aural exam - the tape recorder was very low and we could not hear anything.
Przymiotnik ‘aural’ znaczy „związany z organem słuchu”, np. ‘aural examination’ („egzamin ze słuchu”).
Przymiotnik ‘oral’ znaczy natomiast „ustny”, np. ‘oral examination’ („egzamin ustny”).