Definition: used to emphasize one part of a sentence Level: C2
打电话来的是我姐姐，不是我哥哥。
___It was my sister who called, not my brother.
他们第一次相遇是在巴黎。
___It was in Paris that they first met.
直到昨天我才意识到自己的错误。
___It was only yesterday that I realized my mistake.
