In eight groups of four,each team plays the others in its group.

Do you mean each group has four teams, and each team is againt each team in their group ?

There are eight groups, each having four teams.

Let's take Group #1, which has teams A, B, C, and D.

A, B, C, and D all play each other: A&B, C&D next round: A&C, B&D final round: A&D, B&C

The same thing is going on in each of the other groups.
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Of course, with that, I've pretty much exhausted my knowledge of this type of competition. But if you want to talk American football, I'm your girl!
Dear Grammar Geek,

You wrote " if you want to talk American football, I'm your girl!"

- I think "talk about American football" is better, right?

- And by the way, what does "I'm your girl!" mean in this context?


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"talk X" is idiomatic. It does mean "to talk about."

"I'm your girl!" is like "I'm your man!" - It means "I'm the one for the job." But I'm not a man. I suppose, having recently turned 40, I'm not a girl either, but you don't usually say "I'm your woman."