Cheer up! / Come on! / You can do it!
Used to encourage someone who is struggling, sad, or facing a challenge. Equivalent to 'cheer up', 'hang in there', or 'you've got this' depending on context.
—I'm very nervous before the exam. —Come on, you can do it!
Hang in there, not much left now!
—I'm very tired. —Cheer up, we're almost done!