There are so many story beats that Aliens directly copies from AlienThat ' s because Cameron is a great director but not especially courageous or original in screenwriting . If you pay attention he did the exact same thing with T 2 . The final act is basically the same as T 1 but with a bigger budget and MORE of everything . <| sep |> The thing about Duolingo is that it isn ' t a tool to be used all by itself . Nor is any other online course or app or whatever , for that matter . I find Duolingo great for remembering vocabulary and practicing building sentences yourself as well as some decent listening practice . Oh , and perhaps discipline . But all by itself it is simply not sufficient . You won ' t advance anywhere without an oldfashioned textbook for grammar and routine everyday listening .