<em>The word suffix that has been added incorrectly is </em><em>forgoten </em><em>-the correct option would be </em><em>forgotten</em><em>.</em>
Explanation:
To form the participle of a verb, the general rule establishes that the suffix <em>-ed</em> should be added to the base form. However, there is an exception that explains this mistake: whenever the verb has more than one syllable and the final syllable is stressed, <u>we double the final consonant before the suffix </u><u><em>-ed</em></u>. Therefore, we should double the <em>t</em> in <em>forgot </em>before adding -<em>ed</em>, and the correct version of the participle would be forgotten.
