Most Commonly Used English in Chinese -- 振作起来

English: Cheer up!
Chinese: 振作起来 (zhèn zuò qǐ lai)！

Example: Evan gets depressed every Sunday because he has to go back to work the next day. So his friend Jason says to him:

“哥们儿，振作起来！离周末只剩五天了！” (Gē men'r, zhèn zuò qǐ lai! Lí zhōu mò zhǐ shèng wǔ tiān le!)/ Dude, cheer up! Only five days left until the weekend!