A couple years ago, I was at a Chinese(-American) gathering and the topic of 成语 came up. One of them was 三更半夜. My family is from Hangzhou, and previously I had always known of it as 深更半夜. On the other ...
In my previous question I found the following about tone sandhi and yī 'one': yī on its own or not followed by other tones yī → yí when followed by a fourth tone yī → yì when followed by ...