To give extra importance to one part of a sentence we use:
- It is/was _________ that ________
The underlined words in the examples are emphasized.
It’s because we’re so similar that people think we’re sisters.
It’s the piano (that) he’s good at, not the violin.
Although we tend to use that in spoken English, we may also use which or who.
It’s my finances which I’m worried about most.
It was my brother who gave me the watch — not my sister.
Where and when tend to be used more informally.
It was nine o’clock when we were supposed to meet.
It was Australia where I began finding myself, not Thailand.
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