Could you please tell me which sentence is correct?
- It's not worth learning many a language when you haven't got the opportunity to use them.
- It's not worth learning many a language when you haven't got the opportunity to use it.
Until now, I've only known that "many a + singular noun" takes a singular verb. Unfortunately, I've never heard about the correct pronoun for it.
Before I posted this question, I'd done some searching and this is the only one that I've found useful. But it seems to be a mere opinion, not an officially accepted usage or something like that. What I really want is a widely accepted usage.
Please enlighten me. Thanks in advance.
P/s: This is not a duplicate of this question. In other words, I've already known the use of "many" vs "many a". You can clearly see that my question isn't about "many" vs "many a". In addition to that, the link above refers to a question that doesn't even mention anything about "pronoun" while mine is mainly about it.