Learning English is a journey filled with exciting challenges. While minor slips are part of learning, the Pareto Principle states that focusing on correcting the top 20% of your recurring mistakes will eliminate 80% of misunderstandings. By targeting these high-frequency grammar and vocabulary errors, you will gain confidence and speak much more clearly.
In this guide, we group the 20 most typical errors into five core categories. Each section provides a side-by-side comparison table of incorrect and correct usage, followed by the exact rule you need to follow.
1. Articles: A, An, and The
English articles can be confusing for speakers of languages that do not use them (like Slavic languages). The most common issues involve generalizing vs specifying.
| ❌ Wrong | ✅ Correct | Why |
|---|---|---|
| I love the music. | I love music. | When speaking about a concept in general, do not use the definite article 'the'. |
| He is doctor. | He is a doctor. | You must use the indefinite article 'a/an' when naming a person's profession. |
| I saw an European car. | I saw a European car. | 'European' begins with a consonant sound ('yoo-'), so it takes 'a', not 'an'. |
| She goes to the school. | She goes to school. | Do not use 'the' when referring to institutions (school, bed, prison) for their primary purpose. |
2. Present Perfect vs. Past Simple
Mixing up tenses is a major source of confusion. The key difference is whether the time period is finished or still connected to the present.
| ❌ Wrong | ✅ Correct | Why |
|---|---|---|
| I live here since 2020. | I have lived here since 2020. | For actions that started in the past and continue in the present, use Present Perfect. |
| I have seen him yesterday. | I saw him yesterday. | 'Yesterday' is a finished time period. Use Past Simple, not Present Perfect. |
| We knew each other for years. | We have known each other for years. | If you still know each other, use Present Perfect. 'Knew' implies a past, finished state. |
| How long do you study English? | How long have you been studying English? | To ask about the duration of an ongoing action, use Present Perfect Continuous. |
3. Prepositions of Time and Place
Learners frequently mix up the prepositions 'in', 'on', and 'at' because they translate directly from their native prepositions.
| ❌ Wrong | ✅ Correct | Why |
|---|---|---|
| I am in the bus. | I am on the bus. | Use 'on' for public transport where you can walk around (bus, train, plane). |
| I will meet you in Saturday. | I will meet you on Saturday. | Use the preposition 'on' for specific days of the week and dates. |
| The meeting is on 3 PM. | The meeting is at 3 PM. | Use the preposition 'at' for specific times (hours, clock times). |
| I am sitting at the kitchen. | I am sitting in the kitchen. | Use 'in' for enclosed spaces (rooms, buildings, cars). |
4. Gerund vs. Infinitive
Certain verbs must be followed by a gerund (-ing form), while others require an infinitive (to + verb).
| ❌ Wrong | ✅ Correct | Why |
|---|---|---|
| I look forward to meet you. | I look forward to meeting you. | The phrase 'look forward to' requires a gerund because 'to' is a preposition here. |
| I want speaking English. | I want to speak English. | The verb 'want' is always followed by an infinitive (to + verb). |
| She stopped to smoke. | She stopped smoking. | 'Stopped to smoke' means she paused an activity to have a cigarette. 'Stopped smoking' means she quit. |
| I don't mind to help you. | I don't mind helping you. | The verb 'mind' must be followed by a gerund (-ing). |
5. English False Friends for Slavic Speakers
Words that look similar to words in Slavic languages but have entirely different meanings in English.
| ❌ Wrong | ✅ Correct | Why |
|---|---|---|
| I actually work here. | I currently work here. | 'Actually' means 'in fact / really'. To express 'at the present time', use 'currently'. |
| I want to archive success. | I want to achieve success. | 'Archive' means to store documents. To accomplish a goal, use 'achieve'. |
| I received a list from him. | I received a letter from him. | 'List' is a checklist or roster. A written message is 'a letter' (list in Polish/Russian). |
| He works like a manager. | He works as a manager. | Use 'as' for actual jobs and roles. 'Like' means similar to but is not the actual role. |
Mistake #1: Saying 'I am agree'. In English, 'agree' is a verb, not an adjective. Therefore, you do not need the auxiliary verb 'am'. Simply say: 'I agree' (or 'I disagreed' in the past).
How to Stop Making Mistakes
- Practice tenses with context-driven sentence cards rather than memorizing isolated grammar charts.
- Read books or articles out loud to train your tongue to repeat correct article-noun collocations.
- Write short paragraphs daily and use automated checkers like Grammarly to catch recurring preposition errors.
- Keep a pocket notebook of English words that look similar to your native language but have distinct meanings.
Ready to take your English to the next level? Read our guide on the 1000 most common English words at /en/blog/learn-english-1000-most-common-words or explore lessons at /en/english/level/a1.
Try it yourself — free
1000 most important words. AI explanations. Spaced repetition. Fast start.