It was I that met Tom at school yesterday.
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It was Tom that I met at school yesterday.
It was at school that I met Tom yesterday.
It was yesterday that I met Tom at school.
I did meet Tom at school yesterday.
It was in 1989 that I started to write English books.
It was the famous Greek philosopher Diogenes who went around the streets of Athens, lantern in hand, looking for an honest man.