Chinese Grammar learning: Adj + 极了
Just as 死了 can be used to intensify negative adjectives, 极了 (jíle) can be used to intensify positive adjectives.This is used in spoken, colloquial Chinese. 极 means "extreme" or "utmost", so using this grammar pattern takes your positive adjectives to the extreme!
It's as simple as using 极了 after the positive adjective.
Subject + Positive adjective + 极了
Note that this structure is a degree complement (called 程度补语 in Chinese)， and one of the few that you can use after the adjective and without adding a 得.
她 好看 极了。
这 个 啤酒 好喝 极了。
你的 中文 好 极了。
Remember to add the 了, since this is sort of an exclamatory statement similar to 太好了. It would be incorrect without it.