1. Pull yourself together. 振作起来。

2. Keep your chin up. 别灰心。

3. Don't let it get you down. It will be over with soon. 别为此烦恼。事情很快就会过去的。

4. Don't be so miserable! 别这愁眉苦脸的。

5. Cheer up! things will work out for the best. 高兴点儿。事情会有好结果的。

6. Take heart- we'll find a way out. 振作起来，我们会有办法的。

7. Keep trying! Don't give up the ship. 继续努力! 别轻易放弃!

8. Loosen up! It's not worth getting upset about. 放松点儿！不值得为这件事苦恼。

9. Hang in there. Things will get better. 坚持住，情况会好起来。

10. Keep smiling! things will calm down. 乐观一点，事情会平息下来的。

11. It's not as bad as all that. 事情没有那么糟。

12. Things are never as bad as they seem. 事情往往不像看上去的那么糟。

13. Win a few, lose a few. That's life. 有得也有失，生活就是如此。

14. Let's look on the bright side. 我们来看看它好的一面。

15. Every cloud has a silver lining. 再黑暗的地方也有一线光明。

16. When god closes a door, he opens a window. 山不转水转。

17. Tomorrow is another day. 有明天就有希望。

18. Stop carrying the weight of the world on your shoulders. 别太操心了，没有你地球照样转。（carry the weight of the world on one's shoulders：自以为重任在肩。）

Thank you for your sharing   

It is to work oneday ,i belive

great, thanks for sharing

  Useful

hi baby  everyday is a new day ,dont worry just keep it up!

thanks a lot!

Good!
I think It will help me improve my express ability!

Usually I just say everything goes for the best, or something like that. But it just occurs to me the TBBT version " There there", if the one you are talking to is a huge fan of that show, this might work as well.

useful! thanks!