At lunch time, I’m pretty silent person, because…
1. Don’t understand the sentense
2. Understand the sentense, but I don’t know about the topic.
3. Understand and know about the topic, but takes time to think about right answer, and chance go away.
4. I think I understand, but I’m not sure I understand properly.
5. Just tired to listen English. My ear closed.
Otherwise,
I talk.
which is rare 🙂