Question

how should writers adjust grammar in a quote that does not match the grammar of their sentence?
correct the grammar in the quote and hope no one notices.
use brackets to show a grammatical change in the quote, but the meaning stayed the same.
do not make grammatical changes to the quote, even if it does not match the rest of your sentence.

Explanation:

When quoting, if the grammar of the quote doesn't match the sentence's grammar, brackets can be used to show a grammatical change while keeping the meaning intact. This is a standard practice to maintain the integrity of the original quote and also make the overall sentence grammatically correct. Correcting the grammar without indication is unethical as it misrepresents the original, and not making any changes can lead to a grammatically - incorrect sentence in some cases.

Answer:

Use brackets to show a grammatical change in the quote, but the meaning stayed the same.