I have three questions about the text below.
1. In the context of the text below, can I use "join" instead of "participate"?
2. Can I use "Not so often" instead of "Not very often"?
3. Which is more commonly used in everyday conversation, "Not very often" or "Not so often"?
※Text
Ken: Last week, there was a corporate golf event. I participated and played golf.
Tom: Sounds good! Do you often play golf?
Ken: Not very often. I don’t get many chances to play.
Thank you!