A german friend of mine wrote simple sentence today "Das sind beides schöne Akzente", to which I asked her, shouldn't it be "Die sind beide schöne Akzente"? She told me my version sounded wrong but she couldn't tell me why and provided a few more examples where I would have also said "die" instead of "das".
I thought I should use die as it is the plural article and in these instances we are talking about a plural. I would like to understand why "Das" is correct here instead of "die". Here are a few more examples:
Das sind große Hunde
Das sind blöde Touristen.
Das sind viele Mädchen