1. In linguistics, a modifying word or phrase that is not essential to the core meaning of the sentence and can be removed without changing the fundamental grammatical structure or meaning
In the sentence 'The book, which was published last year, is on the shelf,' the relative clause is a free modification.
Na frase 'O livro, que foi publicado no ano passado, está na prateleira', a oração relativa é uma modificação livre.
2. A parenthetical or supplementary element in a sentence that provides additional information but is not required for the sentence to be grammatically complete
The phrase 'in my opinion' in 'In my opinion, this approach is better' is a free modification.
A expressão 'na minha opinião' em 'Na minha opinião, esta abordagem é melhor' é uma modificação livre.
This is primarily an academic and linguistic term used in grammar instruction and linguistic analysis in both English-speaking and Portuguese-speaking countries. It is particularly prevalent in university linguistics courses and grammar textbooks. The concept is important for teaching proper punctuation and sentence structure, as free modifications typically require commas or other punctuation to set them apart from the main clause.