Applicable to many people’s opinion of how good their English is: the cognitive bias of overestimating your skills because you aren’t fully aware of your shortcomings.
No matter what your personal take is on Black Peter, be aware that Brits and Americans are liable to see him as an offensive racial stereotype.
People regularly tell me that they keep hearing natives use the words and phrases I say should be avoided. Which we do; the question is how often. Here are some figures to help back it up.
The most striking point is that computerized NL-EN translation makes the same mistakes as Dutch people when they write English.
You may well think your English is great – after all, you can communicate with your English-speaking colleagues well enough and write reports and articles that people can understand. But there’s always room for improvement. Usually a lot of improvement