我wǒ不bú是shì生shēng气qì，而ér是shì失shī望wàng。

I am not angry, but rather disappointed.

他tā不bú是shì不bú会huì，而ér是shì不bù想xiǎng做zuò。

It is not that he cannot, but that he does not want to.

这zhè不bú是shì结jié束shù，而ér是shì开kāi始shǐ。

This is not the end, but rather the beginning.

我wǒ要yào的de不bú是shì钱qián，而ér是shì尊zūn重zhòng。

What I want is not money, but respect.

他tā不bú是shì医yī生shēng，而ér是shì老lǎo师shī。

He is not a doctor, but a teacher.