这手表很贵。

Zhè shǒubiǎo hěn guì.

This watch is very expensive.

贵的东西不一定好。

Guì de dōngxi bù yídìng hǎo.

Expensive things aren't always good.

这礼物一定很贵。

Zhè lǐwù yídìng hěn guì.

This gift is definitely very expensive.