=>
1. Talking to her friend, she forgot everything around her.
2. Watching the news every day, we know what's going on in the world.
3. Being vegetarians, they don't eat meat.
4. Having asked his mother's permission, he went out to play.
5. Drinking too much, he hadn't driven home himself.
Hai vế cùng chủ ngữ -> rút gọn thành Ving vế đầu
Having V3/ed (hai vế cùng chủ ngữ, hai hành động xảy ra theo thứ tự trước sau)