例：A：You’ve met my mother, haven’t you?
B：No, it was your sister (that) I met!
➡ 強調我遇見的對象，是你的姊妹(sister)，而非你的媽媽(mother)。
例：A：Sharon’s car got broken into yesterday, did it?
B：No. It was Nina’s car that got broken into!
➡ 強調被盜的車子為Nina的車子，而非Sharon的車子。
例：It wasn't until we arrived at the hotel that (when) we met her.
➡ 強調直到我們抵達飯店時，我們才遇見她。
例：It was this novel that they talked about last week.
(他們上週討論的就是這部小說。)
例：It was because of his carelessness that the accident happened.
(就是因為他的粗心，意外發生了。)
例：It’s the young peoplethat have suffered severe job losses in the region. 
(該地區遭遇嚴重失業問題的人，就是年輕人。)
例：It is the release of nuclear energy within the Sun which enables it to send out so much energy to the Earth. 
(正是太陽內部釋放出來的核能使太陽能夠對地球發射出如此多的能量。)
例：It’s heat which makes matter expand and melt.
(正是熱使物質膨脹與熔化。)