他tā是shì第dì一yī个gè到dào的de人rén。

He was the first one to arrive.

这zhè是shì我wǒ第dì一yī个gè孩hái子zi。

This is my first child.

我wǒ第dì一yī个gè想xiǎng到dào的de就jiù是shì你nǐ。

The first one I thought of was you.

他tā是shì第dì一yī个gè到dào的de客kè人rén。

He is the first guest to arrive.

你nǐ是shì我wǒ认rèn识shi的de第dì一yī个gè外wài国guó人rén。

You are the first foreigner I have ever met.