The usual suspects
1) Present perfect vs past simple (“I have gone yesterday”). 2) Article misuse (“I go to university” vs “the university”). 3) Prepositions of time and place.
4) Subject-verb agreement in long sentences. 5) Overusing “will” when “going to” or present continuous is more natural.
How to retire a mistake
When Telearn corrects you, rewrite the sentence once in text and once in voice. Then force the correct form into your next three messages.
Ask: “Quiz me on present perfect for 5 minutes.” Spaced retrieval beats reading the explanation again.