除非(chú fēi) - unless, only if in Mandarin

除chú非fēi你nǐ道dào歉qiàn，否fǒu则zé我wǒ不bù原yuán谅liàng你nǐ。

Unless you apologize, I won't forgive you.

除chú非fēi下xià雨yǔ，否fǒu则zé我wǒ们men去qù爬pá山shān。

Unless it rains, we will go hiking.

他tā不bú会huì来lái，除chú非fēi你nǐ邀yāo请qǐng他tā。

He won't come unless you invite him.

除chú非fēi下xià雨yǔ，我wǒ们men都dōu去qù。

Unless it rains, we will all go.

除chú非fēi你nǐ道dào歉qiàn，我wǒ才cái原yuán谅liàng你nǐ。

Only if you apologise will I forgive you.