The structure of emphasizing subject, object and adverbial is: it is/was+emphasizing part+that+the rest of the original sentence. The emphasis predicate is based on the verb do/does/did+. Really? 、? Sure? This structure can only be used in declarative sentences or imperative sentences.

the focus of emphasis is the subject of the original non-emphasis structure.

it is the first step that costs.

Everything is difficult at the beginning.

It is the love that makes the world go round.

Love is the force that drives the world.

It is the last straw that breaks the camel's back.

When the camel is overloaded, adding a straw can overwhelm it.

It is the mind that makes the body rich.

People's thoughts enrich their bodies.

it's the unforeseeable that always happens.

There are unexpected events in the sky, and people have misfortune and fortune.

it is not the place, nor the condition, but the mind alone that can make any one happy or miserable.

People's joys and sorrows lie not in the place, nor in the environment, but in their thoughts.

The emphasis is on the object of the original sentence.

It is education that we should be dependent on. It is teachers that education should be dependent on.

We should rely on education, and education should rely on teachers.

The emphasis is on the predicate of the original sentence

The fool does think he is wise, but the wise knows himself to be a fool.

A fool thinks he is wise, but a wise man knows himself.

The emphasis is on the adverbial

It is not by the grey of the hair that one knows the age of the heart.

White hair can't tell you the age of a person's heart.

it is in the dark areas of science that great men win recognition.

Great men win reputations in those scientific fields with dim hopes.