We'd love to fix all issues regarding our text-to-speech voice, but that's sadly not one of the priorities of the developers' team at the moment and, just like all IT-related issues, it's not something in the power of the Portuguese language team to fix.
That said, we always encourage our students to see Duolingo as just one of many instruments they can use in their language learning journey while we keep striving to improve the course, and that includes actual immersion (listening practice) or using a different text-to-speech simulator (while no simulator will ever be without its faults, I believe IVONA Text-to-Speech is quite good).
Thank you for your feedback, and good luck with your studies :)
Bring(s) is Simple Present Tense, while brought is Past Tense which is not taught on Duo for many more lesson units (even beyond adjectives and adverbs and numbers too)
In fact, the first Past Tense lesson unit on Duo (at least for Portuguese) comes after the third unit on Present Verbs.