我身上只有二十块钱。

Wǒ shēnshang zhǐyǒu èrshí kuài qián.

I only have twenty yuan on me.

我们班只有她没有参加考试。

Wǒmen bān zhǐyǒu tā méiyǒu cānjiā kǎoshì.

In our class only she didn’t take the exam.

只有努力学习，你的中文才会越来越好。

Zhǐyǒu nǔlì xuéxí, nǐ de Zhōngwén cái huì yuèláiyuè hǎo.

Only by studying hard will your Chinese get better and better.