Answer:
to change another person’s words to grammatically fit it into a sentence
Step-by-step explanation:
Sometimes when people are talking, they misspeak. While this is normal in day-to-day conversation (and is required to be recorded verbatim in a transcript!), this must be modified in an academic paper. Hence, brackets are used to insert or omit words, word parts, or letters in order for the sentence to be grammatically correct.