"The cats drink water."
Translation:Os gatos bebem água.
when you commit a mistake, it appears underneath "report a mistake" there are some options like "my answer should be accepted" " the sentence sounds weird" then u submit. if they think ur right, the'll send u an email letting u know they have accepted your answer and included it now :) this way you help duolingo, new learners and yourself :)
Well... im afraid u have to go back to that activity again and commit the mistake on purpose or do that on the discussion part when u open the level (under the books you find new discussion) at the bottom of the homepage u find feedback. There u can report that too :)