![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
Mọi người cho em hỏi 2 câu dưới đây khác nhau như thế nào ạ?
1. It's been a long time since we've seen each other.
2. It's been a long time since we saw each other.
1. It's been a long time since we've seen each other.
2. It's been a long time since we saw each other.