English is a global language used in schools, workplaces, travel, and international communication. Yet, even fluent speakers often make grammar mistakes. These errors may seem small, but they can change the meaning of a sentence or reduce clarity and professionalism. At Study Rhino, we believe that understanding and correcting these common mistakes is the first step to mastering English.
In this article, we’ll break down the most frequent grammar mistakes, provide clear examples, and offer simple tips to avoid them. Whether you’re a student, a professional, or just brushing up your skills, this guide is for you.
1. Subject-Verb Agreement Errors
❌ He go to school every day.
✅ He goes to school every day.
Many learners forget that the verb must agree with the subject in number and person. Singular subjects take singular verbs; plural subjects take plural verbs.
Tip: Add an “-s” to the verb when the subject is third person singular (he, she, it) in the present simple tense.
2. Wrong Use of Tenses
❌ I am going to the mall yesterday.
✅ I went to the mall yesterday.
Choosing the correct verb tense is essential for expressing time clearly. Mixing up past, present, and future tenses can confuse the reader.
Tip: Use signal words like yesterday, now, tomorrow to help pick the correct tense.
3. Using ‘a’ instead of ‘an’ (and vice versa)
❌ He is an honest man. (Correct)
❌ He is a honest man. (Incorrect)
Use “a” before words starting with consonant sounds and “an” before vowel sounds.
Tip: Focus on sound, not just the first letter. For example, “hour” starts with a vowel sound, so we say “an hour.”
4. Misplaced Modifiers
❌ She nearly drove her kids to school every day.
(This implies she almost drove them but didn’t.)
✅ She drove her kids to school nearly every day.
Misplaced modifiers confuse meaning. They should be placed close to the word they describe.
Tip: Always put descriptive words next to the things they are describing.
5. Confusion Between ‘Its’ and ‘It’s’
❌ The dog chased it’s tail.
✅ The dog chased its tail.
✅ It’s raining outside. (It is)
It’s = it is or it has
Its = possessive form of “it”
Tip: If you can replace “it’s” with “it is” or “it has,” then use the apostrophe.
6. Using ‘Me’ instead of ‘I’ (and vice versa)
❌ Me and John went to the store.
✅ John and I went to the store.
“I” is used as the subject of a sentence, while “me” is used as the object.
Tip: Remove the other person from the sentence and test it:
Would you say, “Me went to the store”? No. So it should be “I.”
7. Overusing or Misusing Commas
❌ Let’s eat Grandma!
(Implies we’re eating Grandma!)
✅ Let’s eat, Grandma!
(Now it’s clear we’re speaking to her.)
Misplacing commas can change meaning entirely.
Tip: Use commas to separate items in a list, before conjunctions, and after introductory phrases—but not excessively.
8. Incorrect Plural Forms
❌ She has many childrens.
✅ She has many children.
Some words have irregular plurals (child → children, mouse → mice, foot → feet).
Tip: Memorize the most common irregular plurals. There’s no shortcut, unfortunately!
9. Dangling Participles
❌ Walking down the street, the tree looked beautiful.
(The tree isn’t walking!)
✅ Walking down the street, I noticed the tree looked beautiful.
When the opening phrase describes something, make sure it’s connected to the right subject.
Tip: After introductory phrases, the subject should match the phrase logically.
10. Run-On Sentences
❌ I went to school I forgot my books I came back home.
✅ I went to school, but I forgot my books, so I came back home.
Run-on sentences make writing hard to follow. Break long ideas into multiple clear sentences.
Tip: Use conjunctions (and, but, so), punctuation (commas, periods), or semicolons to separate thoughts.
11. Using the Wrong Preposition
❌ She is good in dancing.
✅ She is good at dancing.
Certain verbs and adjectives go with specific prepositions, and these combinations don’t always follow logic.
Tip: Learn common verb-preposition pairs:
Good at, interested in, tired of, afraid of
12. Too vs. To vs. Two
❌ I want to go their to.
✅ I want to go there too.
Too = also or excessively (too much)
To = a direction or infinitive verb marker (to the store, to eat)
Two = the number 2
Tip: If you mean “also,” use too. If it’s about direction or action, use to.
13. ‘There,’ ‘Their,’ and ‘They’re’ Confusion
❌ Their going to the park.
✅ They’re going to the park.
There = place (over there)
Their = possessive (their car)
They’re = they are
Tip: Try replacing with they are. If it works, use they’re.
14. Incorrect Use of Articles
❌ I saw a eagle.
✅ I saw an eagle.
❌ She is best player.
✅ She is the best player.
Articles (a, an, the) can change the meaning of a noun.
Tip:
A/an = general
The = specific or unique
15. Redundant Double Negatives
❌ I don’t know nothing.
(This actually means you know something.)
✅ I don’t know anything.
Two negatives make a positive in English grammar.
Tip: Use only one negative word in a sentence unless using emphasis deliberately (in poetic or informal speech).
16. Misusing Apostrophes for Plurals
❌ Banana’s for sale!
✅ Bananas for sale!
Apostrophes are not used to make plurals.
Tip: Use apostrophes only for:
Possession (John’s book)
Contractions (don’t = do not)
17. Inconsistent Pronoun Reference
❌ When a student is late, they should apologize.
(This is widely accepted now, but traditionally “they” doesn’t match singular “student.”)
✅ When students are late, they should apologize.
Or: When a student is late, he or she should apologize.
Tip: Make sure pronouns agree in number with the nouns they refer to. (Note: singular “they” is increasingly accepted in modern English.)
18. Improper Comparative and Superlative Forms
❌ This is the most easiest question.
✅ This is the easiest question.
Words like easier, better, and faster don’t need more or most.
Tip: Use “-er” and “-est” for one-syllable words, and “more” or “most” for longer words.
19. Using ‘Less’ with Countable Nouns
❌ There were less people at the party.
✅ There were fewer people at the party.
Less = uncountable (less water, less money)
Fewer = countable (fewer apples, fewer students)
20. Overusing Passive Voice
❌ The essay was written by me.
✅ I wrote the essay.
Passive voice isn’t wrong, but it often sounds weaker.
Tip: Prefer active voice for clear, engaging writing.
Final Thoughts from Study Rhino 🦏
Grammar isn’t just about following rules—it’s about communicating clearly and confidently. Mistakes are natural, especially when learning a second language. What matters is awareness and consistent practice.
At Study Rhino, we’re committed to making grammar fun, simple, and accessible. Bookmark this list, revisit your trouble spots, and keep practicing with real-world examples. The more you write, read, and speak, the more natural correct grammar will become.
Stay sharp, stay curious, and keep learning—because good grammar is great power!
