50 Common English Grammar Mistakes and How to Avoid Them

 

Almost everyone makes the same grammar mistakes, and that's actually good news. If errors were random, fixing them would take years. But because most mistakes repeat across learners of every background, you can fix a surprising percentage of your English simply by knowing which fifty patterns to watch for. This guide on common English grammar mistakes was built exactly for that purpose — not as a dry rulebook, but as a practical map of where people trip and how to step around it.

One more thing before we start: fluent speakers make mistakes too. The difference is they catch and correct them almost instantly. That instinct is what this list is meant to build in you.

Why the Same Mistakes Keep Repeating

Most grammar errors don't come from carelessness. They come from one of three sources: direct translation from your native language, overgeneralizing a rule that only works part of the time, or simply not noticing a small word that changes meaning. Once you recognize which of these three causes a mistake, correcting it becomes far easier, because you're no longer guessing — you're targeting the actual root.

With that in mind, here are fifty of the most common slip-ups, grouped by category so your brain can process them in manageable clusters rather than one giant, exhausting list.

Subject-Verb Agreement Mistakes

1. "He don't like coffee" → "He doesn't like coffee." Third-person singular subjects need "doesn't," not "don't."
2. "The team are winning" (in American English) → "The team is winning." Collective nouns typically take singular verbs in American usage.
3. "Everyone have their reasons" → "Everyone has their reasons." Words like everyone, everybody, and someone are always singular.
4. "There is many reasons" → "There are many reasons." Match the verb to the noun that follows "there," not to "there" itself.
5. "Neither of them are ready" → "Neither of them is ready." "Neither" and "either" take singular verbs.

Tense Mix-Ups

6. "I have went there" → "I have gone there." Present perfect needs the past participle, not the simple past form.
7. "She is knowing the answer" → "She knows the answer." Stative verbs like know, believe, and want are rarely used in continuous form.
8. "I am living here since 2020" → "I have been living here since 2020." Ongoing duration from the past needs a perfect form, not simple continuous.
9. "Yesterday, I have finished my homework" → "Yesterday, I finished my homework." A specific past time word rules out present perfect entirely.
10. "When I will arrive, I will call you" → "When I arrive, I will call you." Time clauses starting with "when," "before," or "after" use present tense even when referring to the future.

Preposition Errors

11. "Married with" → "married to"
12. "Good in" → "good at"
13. "Depend of" → "depend on"
14. "Discuss about" → "discuss" (no preposition needed at all)
15. "Arrived to the airport" → "arrived at the airport"

Prepositions rarely translate directly between languages, which is exactly why they cause so much trouble. The only real fix is to learn common verb-preposition pairs as fixed chunks, rather than trying to apply logic to each one individually.

Article Mistakes (A, An, The)

16. "I am engineer" → "I am an engineer." Singular countable nouns almost always need an article.
17. "The honesty is important" → "Honesty is important." Abstract, general nouns usually drop "the."
18. "I went to the school" (meaning school in general) → "I went to school." Dropping "the" signals the general concept, not a specific building.
19. "An university" → "a university." Article choice follows sound, not spelling — "university" starts with a "y" sound.
20. "I have a idea" → "I have an idea." Watch for vowel sounds directly following the article.

Word Order Problems

21. "I like very much this song" → "I like this song very much." Adverbs of degree usually follow the object, not sit between the verb and object.
22. "Always I go to bed early" → "I always go to bed early." Frequency adverbs generally sit before the main verb.
23. "She speaks well English" → "She speaks English well." Adverbs describing how something is done typically follow the object.
24. "Where you are going?" → "Where are you going?" Questions require the auxiliary verb before the subject.
25. "I don't know where is he" → "I don't know where he is." Embedded questions keep normal word order, unlike direct questions.

Confused Word Pairs

26. Its vs. it's — "its" shows possession, "it's" means "it is."
27. Your vs. you're — "your" shows possession, "you're" means "you are."
28. Then vs. than — "then" relates to time or sequence, "than" is used for comparison.
29. Affect vs. effect — "affect" is usually a verb (to influence), "effect" is usually a noun (a result).
30. Fewer vs. less — "fewer" applies to countable nouns (fewer apples), "less" applies to uncountable nouns (less water).
31. Lie vs. lay — "lie" means to recline (I lie down), "lay" means to place something (I lay the book down).
32. Who vs. whom — "who" acts as the subject, "whom" acts as the object of a verb or preposition.
33. Its vs. their — don't mix singular possessive "its" with plural possessive "their" when referring to a company or group inconsistently.

Punctuation Slip-Ups

34. Comma splices — joining two full sentences with just a comma ("I was tired, I went home") instead of using a conjunction or period.
35. Missing Oxford comma in lists that need clarity — "I invited my parents, Lisa and Tom" can accidentally suggest Lisa and Tom are your parents.
36. Apostrophes used for plain plurals — "banana's for sale" should simply be "bananas for sale."
37. Overusing exclamation points, which weakens emphasis rather than strengthening it.
38. Missing commas after introductory phrases — "After the meeting we left" should be "After the meeting, we left."

Countable and Uncountable Noun Errors

39. "Many informations" → "much information" or "a lot of information." Information is uncountable in English.
40. "Advices" → "advice" or "pieces of advice." Advice has no plural form.
41. "Furnitures" → "furniture" or "pieces of furniture." Same rule applies here.
42. "A little peoples" → "a few people." "People" is already plural; "peoples" refers to distinct ethnic or cultural groups, a different meaning entirely.

Double Negatives and Negation Mistakes

43. "I don't have nothing" → "I don't have anything." English avoids stacking two negatives within one clause.
44. "I can't hardly hear you" → "I can hardly hear you." "Hardly" already carries negative meaning, so pairing it with "can't" creates a double negative.
45. "Nobody don't like that" → "Nobody likes that." Negative subjects pair with positive verbs.

Comparative and Superlative Mistakes

46. "More better" → "better." Don't combine "more" with an already comparative form.
47. "The most best" → "the best." Same rule applies to superlatives.
48. "More easy" → "easier." Short adjectives typically take "-er," not "more."
49. "Beautifuler" → "more beautiful." Longer adjectives typically take "more," not "-er."
50. "As tall than him" → "as tall as him." Equal comparisons use "as...as," not "as...than."

How to Actually Fix These Mistakes Long-Term

Reading a list is one thing. Making the correction automatic is another. A few habits genuinely help close that gap:

• Keep a running notebook of your own personal repeated mistakes, not a generic list. Your brain remembers errors it made itself far better than ones it only read about.
• Read your own writing aloud. Mistakes that look fine on paper often sound wrong when spoken, especially word order and missing articles.
• Practice minimal pairs — write two versions of the same sentence, one correct and one with the common error, and say both aloud to train your ear to notice the difference.
• Ask a fluent speaker to flag just one category of mistake at a time (say, prepositions) instead of correcting everything at once, which tends to overwhelm rather than help.

A Small Mindset Shift That Changes Everything

Here's something worth remembering: grammar mistakes aren't a sign of weak intelligence or poor effort. They're simply evidence that your brain is applying patterns from a different language system, one that served you perfectly well until now. Correcting these fifty patterns isn't about erasing that background; it's about adding a second, equally valid system on top of it.

Treat each mistake on this list not as a failure to memorize, but as a small doorway. Walk through one at a time, notice it in your own speech and writing over the next few days, and let repetition do the rest. Grammar accuracy isn't built overnight, but it is built — steadily, mistake by mistake, correction by correction, until one day you realize you stopped needing the list altogether.