He works better than his brother (positive)
Answers
Explanation:
Changing something from comparative degree (or superlative degree) into the positive involves removing the comparison to other things or people and changing the form of the adjective/adverb.
"Better" is an irregular adjective. The three degrees are "good", "better", and "best". So, if you want to make something into the positive degree, you use the word "good".
He is good.
This can sound a bit odd because "good" (when used alone) has the added meaning of "behaving in a moral fashion".
behaving correctly or being right according to accepted moral standards
It is similar to "he is a good person".
To avoid this "better" is usually defined more specifically by saying what someone is better at or how something is better:
This cake tastes better than that one.
I'm better at math than at writing.
The positive forms of these statements are, respectively:
This cakes tastes good.
I'm good at math.
So, perhaps a slight change to your sentence is in order.