nostr:npub17sha6ku2fxgt7k268u5kedl5pn25dqrd6v9eqem7kj3s2248mnfs7x6e06 I do’t know if you’ve gotten a good explanation yet, and I certainly don’t have the official grammar verbiage to use, but think of it like this:

The pair (or group or bus or building) is a “container.” The bus goes, singluar. The bus full of boys goes, singular. What’s in the bus? A boy? Or a bunch of boys? So the singular/plural is not about what’s inside the “container.” The container can hold multiple, plural items.

At least that’s how it helps me think of it!