A fast test
After a factual sentence, ask so what? If the next sentence does not answer that for the question, you are still describing.
Upgrade a descriptive sentence
Description: Keynes argued for government spending in downturns.
Analysis: Keynes’s case for counter-cyclical spending matters here because it challenges austerity assumptions that treat deficits as always harmful — an assumption the question asks you to evaluate.
Practice
Highlight every paragraph. If more than half is description on an evaluate brief, revise. Check the draft afterward.