EXPENSIVE
(TO BE)

guì
CHEAP
便宜
piányì

This is 100 more expensive than that.
这个 比 那个 贵 一百 块。
Zhège bǐ nàge guì yībǎi kuài.
Going by plane is faster but more expensive.
坐 飞机 快 可是 贵。
Zuò fēijī kuài kěshì guì.
Was the cellphone that you’ve bought expensive?
你 买 的 手机 贵 不 贵?
Nǐ mǎi de shǒujī guì-bu-gui?
That is expensive, this is slightly cheaper.
那个 很 贵,这个 便宜 一点。
Nàge hěn guì, zhège piányi yīdiǎn.
This is too expensive.
这个 太 贵 了。
Zhège tài guì le.
This is more expensive than that.
这个 比 那个 贵。
<Zhège bǐ nàge guì.>