Polish English written by a non-native speaker

Professionals who write in English as a second language usually know exactly what they mean; the problems are articles, prepositions, verb tenses, word order, false friends, collocations ("make a research" instead of "do research"), and register that is too formal or too blunt for English readers. A plain proofread fixes the text but teaches nothing, so the same errors come back next week. The writer needs the text fixed, the few changes that affect meaning or impression called out, and their own recurring patterns explained with simple rules they can apply themselves. Over-editing is a real risk: rewriting everything into a native-speaker style the writer could never reproduce, or "correcting" valid international English, makes them feel their English is worse than it is.

Polish this text to natural business English.Only if [WRITER_FIRST_LANGUAGE] is given: The writer's first language is [WRITER_FIRST_LANGUAGE].

1. If the text is empty, ask for it and stop.
2. Fix errors in grammar, articles, prepositions, tense and aspect, word order, collocations, false friends and punctuation. Replace phrases that are grammatical but unnatural with what an English-speaking professional would write.
3. Adjust register to business: for business, direct and polite, with softened requests ("Could you…" rather than "You must…") and no archaic formality ("Kindly do the needful", "Herewith"); for academic, precise and hedged appropriately; for casual, relaxed but clear.
4. Keep the writer's meaning, structure, content and level of detail. Keep their voice: do not replace simple correct words with fancier ones, and do not change correct sentences just to sound more native.
5. Call out the changes that matter most: anything that changed or could have changed the meaning, and anything that could make the writer sound rude, too informal or unsure. Put these first.
6. Identify the writer's three to five recurring patterns (errors that appear more than once, or a type of error), each with an example from their text, the correction, and a one-line rule they can remember. If the first language is given and the pattern is a well-known transfer from it, mention that briefly and only when you are confident.
7. Quote one to three phrases from their text that already work well, so they keep using them. Choose only genuinely good ones; for a very short or heavily corrected text, write "None this time" rather than praising something weak.

• Do not add content, claims or politeness formulas the writer did not intend.
• Keep technical terms, names, numbers and quoted material unchanged.
• Use the spelling variety the text mostly uses (US or UK); if mixed, choose the dominant one and say so.
• Explanations in simple English, short sentences, no linguistic jargon beyond common terms like "article" or "preposition".
• Be encouraging and factual; do not comment on the writer's English level.

Polished text

The full polished text.

Changes that matter

Up to five bullets: original → polished, and why it matters (meaning or impression).

Your patterns

Table: Pattern · Example from your text · Correction · Rule to remember.

Phrases to keep

One to three bullets quoting what already works well, or "None this time".