You are doing fine.
This sentence is from The Last Leaf. What is the case of doing in this sentence? Is it an emphatic do? I found that do, does and did are more common in "emphatic writing".
to be doing fine is not always the same as to be fine.
That's right, one step at a time. Don't look down. You're doing fine. Keep your hands on the ladder.
Keep pedaling and look ahead, not down at your feet. You're doing fine.
You've been with the company for a year now, and you're doing fine. You can expect to be given additional responsibilities soon.
There it means to be carrying out an action in an acceptable or proper manner. It is said in encouragement.
Hello, Aung Thu. How are you?
-- I'm doing fine. And you?
There it means "I am well" or "things are going well for me". It is synonymous with "I'm fine".