除非你努力学习，否则无法取得成功。

chúfēi nǐ nǔlì xuéxí, fǒuzé wúfǎ qǔdé chénggōng.

Unless you study hard, you won't be able to succeed.

除非明天下雨，否则我们会去公园。

chúfēi míngtiān xiàyǔ, fǒuzé wǒmen huì qù gōngyuán.

We will go to the park unless it rains tomorrow.

除非你同意，否则我们不会开始。

chúfēi nǐ tóngyì, fǒuzé wǒmen bùhuì kāishǐ.

We won't start unless you agree.