Cách sử dụng
"As an English learner, you can use the expression 'that is to say' when you want to clarify something or give more information about what you just said. It is a way of restating or summarizing what you just mentioned in a different way to help the listener understand better. For example, you could say 'I love playing video games, that is to say, I enjoy the challenge and the competitiveness they bring.' This means that you enjoy playing video games because they provide a challenge and a competitive aspect."