Mistakes Polish speakers make
Polish has no articles, no auxiliary "do" for questions, and only one past tense. Polish speakers often drop English words their native language doesn't use.
Pick one to practise
Dropping articles (a / an / the)
Polish has no articles, so your brain hasn't been trained to add them. English uses "a/an" for first mention of a singular noun, and "the" for known specific things.
Question form without "do / does / did"
Polish forms questions by intonation. English usually needs "do/does/did" + the base verb to make a question.
Past simple vs present perfect
Polish has only one past tense, so "I lived" and "I have lived" sound the same. English uses present perfect (have/has + past participle) for actions starting in the past and continuing to now.
"Make" vs "do"
Polish uses one verb (robić) for both. English splits them: "do" for tasks and duties (homework, work, dishes), "make" for creating (a cake, a decision, a noise).