By using this 3rd person form, maximal social distance is achieved.

This is called Impression formation- the composite mental image one person forms of another.

There is some dialectal variation, particularly in the first and second person singular forms.

These only occur in singular forms and all 3rd person forms.

Certain verbs change their stem vowel for the second and third person singular forms.

This appears to be the third person singular form of "permettre" in the preterite case.

However, as for the second person forms, Brazilians do not use the subjunctive-derived ones in spoken language.

As pronominals, given names are used most frequently in second person form.

Standard English has no marking on its third person singular form in the past tense (he ran).

Third person forms as they exist in English are not directly marked.