This is more expensive than that.
这个 比 那个 贵。
This is 100 more expensive than that.
这个 比 那个 贵 一百 块。
The book that I bought yesterday is good but expensive.
我 昨天 买 的 书 很 好 可是 很 贵。
The restaurant, that we go to, is neither expensive nor cheap.
我们 去 的 饭店 不 贵 也 不 便宜。
It is too expensive. I don't want (it).
太 贵 了，我 不 要 了。
Is the clothes, that you are wearing, expensive?
你 今天 穿 的 衣服 贵 吗？