I understand that the phrase on the outside is commonly used. However, I wonder if I can leave out on the.
Here's a sentence I took from this
He may be cheerful on the outside, but that’s not how he feels.
Why is this not:
He may be cheerful outside, but that’s not how he feels.
for the sake of simplicity?
I have 3 possibility thoughts about this problem:
- They have different meanings.
- Both are OK and always be OK.
- Sometimes we must put on the before outside depends on the context.