Expressing “Unless” with “chúfēi”

除非下大雨，不然我们会去。

Chúfēi xià dàyǔ, bùrán wǒmen huì qù.

Unless it rains heavily, we will go.

除非你自己试一试，不然不会知道结果。

Chúfēi nǐ zìjǐ shì yí shì, bùrán bú huì zhīdào jiéguǒ.

Unless you try it yourself, you will not know the result.

除非他同意，这件事不能决定。

Chúfēi tā tóngyì, zhè jiàn shì bù néng juédìng.

Unless he agrees, this matter cannot be decided.