我会遵守承诺。

Wǒ huì zūnshǒu chéngnuò.

I'll keep my promise.

养宠物是一辈子的承诺。

Yǎng chǒngwù shì yíbèizi de chéngnuò.

Having a pet is a lifelong commitment.

爸爸承诺过我们他会戒烟。

Bàba chéngnuò guo wǒmen tā huì jièyān.

Dad promised us he would quit smoking.