~ではなく (not X but Y)

And what's more, that stuff on the bottom of the memo isn't a stain — it's... b-blood-sealed!?

What matters is not what you read but how you read it.

I tilt my head. Not this pawn, but this knight...

It seems what I just saw wasn't an act — that was her real self.

The king of this country is not a person, but a divine beast with three pairs of wings, said to dwell far up in the heavens.

She isn't my mother — she's my eldest sister.

She's not my older sister — she's my mother.

She's not a nurse — she's a doctor.

Um, Teacher? What you wrote on the board is a trigonometric function, not an exponential function...

Bats aren't birds — they're mammals.

Workers should be paid in proportion to their skills, not their age.

Mr. Suzuki is not a dentist — he's a physician.

The point at issue is not her ability but her personality.

She isn't his older sister — she's his mother.

She came to visit on Monday, not Sunday.

She's not a poet but a novelist.

She gets paid by the day, not by the month.

She did that not for your sake but for her own.

She isn't a doctor — she's a teacher.

What matters is not her ability but her personality.

What's at issue is not his ability but his personality.