服务员,我想要一把刀。
Fúwùyuán, wǒ xiǎng yào yì bǎ dāo.
Waiter, I need a knife.
这把刀很有用,切什么都可以。
Zhè bǎ dāo hěn yǒuyòng, qiē shénme dōu kěyǐ.
This knife is very useful, it can cut everything.
你有刀吗?
Nǐ yǒu dāo ma?
Do you have a knife?