質問: > > A:藤原さんは、もちろん歌だよね? > > B:うん。わたしにはそれしかないから......**ダンスとかあったら全然だったと思う** > > > I don't get what the part ダンスとかあったら全然だったと思う is saying. 全然 is an adverb but there's no verb after it but 思う, but that's separated by a quoting particle, so I assume it doesn't modify it. If that's the case, it's to be assumed that the verb after 全然 is dropped, right? Or should 全然 and と思う go together. Please help me understand the meaning here.
回答: In colloquial speech, 全然 = 全然ダメ. You can treat this 全然 as a 形容動詞 (I just do not like the word "na-adjective" because it does not exist in Japanese.). So, it is quite natural to say 全然だった in informal speech. ダンスとかあったら全然だったと思う, therefore means: "I think I would have been a total failure if I had had to dance or something."