Cách sử dụng
"Join in" means to become a part of an activity or conversation with other people. You can use this expression when you want to participate in something that other people are already doing. For example, if your friends are playing a game, you can say "Can I join in?" to ask if you can play too. You can also use this expression when people are talking about a topic you know something about and you want to add your thoughts to the conversation. To do this, you can say "Can I join in?" or "Can I join the conversation?"