I. "sit in"là phrasal verb nội động từ
II. Cách dùng
1. Mang nghĩa"biểu tình ngồi"
=to go as a group into a public building and refuse to leave or to allow normal activities to continue there until a situation that you are complaining about is changed/occupy a place as a form of protest.
2. Mang nghĩa"tham gia 1 cuộc họp"
=to be present in a meeting or class, watching it but not taking part in it/attend a meeting or discussion without taking an active part in it
- There will be a school inspector sitting in on your class this morning.
- "Do you mind if I sit in?"