Cleft sentences are used to emphasize one part of a sentence in particular. Although they are very useful in writing, where we cannot use intonation for emphasis, they are also used when speaking.
We can emphasize one part of a sentence
๐ The person who broke the glass is waiting outside
๐ The thing which/that I bought was a new book
๐ The place where She found the cat is the kitchen
๐ The day when/that Ana received the news was Monday
๐ The reason why I am studying English is to find a better job.
๐ Why I am studying English is because I want to find a better job
๐ What I found interesting was (to) see him at the conference
๐ What he did was (to) think of a better solution
๐ Where they studied the degree is Florence
๐ All I did was (to) go to the supermarket and buy a few things for the party
๐ All I want is (to) have a peaceful life
๐ What happens is that she doesnโt want to study there
๐ What happened was that they got angry with her
Instead of โthe person who, the thing that, etc.โ we can use It + to be + phrase + relative
๐ It is your birthday that I enjoy so much = What I enjoy so much is your birthday
๐ It was Marรญa who/that I saw yesterday = Who I saw yesterday was Marรญa
๐ It is this kind of film that makes me cry = What makes me cry is this kind of film
Be careful! We cannot use when with adverbial phrases
๐ Itโs Sunday when I see my friends โ Itโs Sunday that I see my friends
๐ Itโs on Sunday that I see my friends โ Itโs on Sunday when I see my friends