Form and rules
How it works
It-cleft pattern: It + be + focused element + who/that clause: It was Ana who noticed the error.
Wh-cleft/pseudo-cleft pattern: What + clause + be + focus: What we need is more time.
A reversed wh-cleft places the focus first: More time is what we need.
Clefts highlight contrast/correction and can focus people, things, times, places or reasons depending on structure.
Do not use clefts merely to make prose longer; they are marked information-structure choices used when focus matters.