Hello,
I think I'm aware of all the theory behind say/speak/tell/talk but I do have one question:
Imagine a lecturer giving a lecture on astronomy with no participation from the audience (they are just listeners). Can I say
He's talking about astronomy or do I have to say
He's speaking about astronomy as the textbooks suggest?
I think I've heard the former somewhere but I might be mistaken.
Thanks in advance for your asnwers.
