小心别碰到他受伤的腿。

Xiǎoxīn bié pèngdào tā shòushāng de tuǐ.

Be careful not to bump his injured leg.

他碰到了一位老朋友，感到非常开心。

Tā pèng dàole yī wèi lǎo péngyǒu, gǎndào fēicháng kāixīn.

He bumped into an old friend and felt very happy.

我不小心碰到了桌子，手疼了一下。

Wǒ bù xiǎoxīn pèng dàole zhuōzi, shǒu téngle yīxià.

I accidentally bumped into the table and my hand hurts a bit.