Explain why some authors use informal English in their writing.

Informal language is more personal than formal language, and it's more casual and spontaneous.

Explanation:

Hope this Helps!!

Informal language is a casual way of speaking. Writers can use this in their dialogue between characters. Informal language is also more personal, so it can be used for that purpose.

renascimento comercial, que, a partir do século 11, inaugurou definitivamente a baixa idade média, que se estenderia até o século 15.