Top 3 Common Mistakes to Avoid in English with examples 1. Misuse of prepositions: Incorrect usage of prepositions (e.g. "I am from New York" instead of "I come from New York") 2. Confusing similar words: Mixing up similar words with different meanings (e.g. "affect" and "effect") 3. Incorrect subject-verb agreement: Not matching verb forms to subject in number (e.g. "They are happy" instead of "They is happy")