你心里在想什么？

Nǐ xīnli zài xiǎng shénme?

What are you thinking in your heart?

比赛前，他心里有点紧张。

Bǐsài qián, tā xīnlǐ yǒudiǎn jǐnzhāng.

Before the match, he felt a bit nervous inside.

我心里很高兴。

Wǒ xīnlǐ hěn gāoxìng.

I am very happy in my heart.