Dutch writers switch to English constantly, in meetings, in reports and halfway through a sentence. Winston AI checks Dutch text for signs of AI writing and highlights the sentences that read as machine-written. This page covers mixed-language documents, je versus u, and how to read a result without overreacting.
Dutch with English in it
Few languages borrow from English as freely as Dutch. A normal project update might say 'de deadline is verschoven, ik stuur je de feedback na de meeting', and nobody blinks. Many university programmes in the Netherlands are taught in English, so students move between the two languages in the same week, sometimes in the same assignment.
Loanwords like deadline, feedback or stakeholder are ordinary Dutch and aren't a sign of AI. If anything, a writer who normally mixes freely handing in spotless, evenly formal Dutch is the more interesting change, and even that is only a reason to ask. Winston AI detects the language automatically, so you can paste a Dutch text with English terms as-is. The same goes for Flemish writing from Belgium, with its own everyday vocabulary (gsm for a mobile phone, frigo for a fridge).
When the language changes by section
Some documents switch language in blocks: a Dutch scriptie with an English abstract, a policy paper with an English appendix, a slide deck with speaker notes in both. For these, scan each language section on its own. It keeps each result easy to read, and you can see whether highlights sit in one part or run through both.
The same goes for job applications, where a Dutch sollicitatiebrief often arrives with an English CV. Scan the letter on its own. A CV is mostly short lines, dates and keywords, which gives little to read either way.