Incorrect spelling, explanation: one of the English rules says that when a regular verb ends with a consonant that is preceded by one vowel, we need to double the consonant. For example, that happens in a verb to beg, which in the past form changes to begged. As a result, many users of English think that the same thing happens with the verb to mention, creating the past form as mentionned. This form, however, is wrong because the last consonant in the word is preceded by two vowels. In such a case we do not double the consonant and the only correct for is mentioned.

Correct spelling, explanation: mentioned is a past form of the verb to mention. The verb itself has its roots in the Latin language and in English, it appeared for the first time in Middle English. As it is a regular verb, ending with a consonant preceded by two vowels, the past and past participle form is created by adding an -ed ending, without introducing any other changes.

Definition of mentioned:
1. verb – to talk about something, but with no details; to make reference to somebody or something:
They mentioned something about the wedding, but I didn’t think it would happen so soon.
She mentioned you as a potential leader of the team.

Collocations with mentioned
The verb form is usually followed by that clause or by the -ing form of a verb:
My mom mentioned that there would be a surprise birthday party for my dad the following month.
He mentioned taking a bus so you don’t have to pick him up.

Incorrect spelling

Incorrect spelling

Incorrect spelling