What is the subject of this sentence: The games on this shelf are very old.

'games'

Why were you in doubt?

She could be very young and just learning.

We won't know unless we ask.

I believe that real learning is not just giving people the right answer, but by dispelling any confusion or uncertainty in their understanding.

Actually, I was wondering whether her doubt was related to a grammatical error I'm hearing more and more of today, where the 'subject' - verb agreement is being based, not on the real subject of the sentence, but on the noun immediately before the verb.

subject is ''The game''