Each Other vs One Another: Rules, Mistakes & 25 Examples

Introduction

Do you ever stop mid-sentence, wondering whether to say “They helped each other” or “They helped one another“? You are not alone! This is one of the most common questions ESL learners ask, and the good news is that the answer is simpler than you think. In this guide, we will look at the traditional rules, the modern usage, and the everyday situations where both phrases work perfectly well.

What Is ‘Each Other’ vs ‘One Another’?

Each other and one another are reciprocal pronouns. A reciprocal pronoun shows that an action goes in two directions — person A does something to person B, and person B does something to person A. For example, in “Anna and Ben love each other,” Anna loves Ben and Ben loves Anna. Both phrases express the same idea of mutual action or feeling; the difference lies mainly in how many people are involved and in style.

Rules

1. Use “each other” for two people or things. This is the traditional rule: “The two sisters call each other every day.”
2. Use “one another” for three or more people or things. “The five teammates support one another during difficult matches.”
3. Remember that both are reciprocal pronouns. They replace phrases like “A helps B and B helps A.” Never add “themselves” or “together” after them.
4. Never use them as subjects of a verb. They are objects only. Say “They know each other,” not “Each other know them.”
5. Know that modern usage is flexible. In everyday English, native speakers often use “each other” for groups of any size, especially in informal speech. “One another” simply sounds a little more formal.
6. Use possessives correctly. Add an apostrophe: “each other’s phone numbers” and “one another’s ideas.”

How to Use It

Follow these simple steps whenever you want to express a mutual action:

1. Check the direction of the action. Ask yourself: “Does A do this to B, and does B do this to A?” If yes, you need a reciprocal pronoun.
2. Count the people or things. Two? Use “each other.” Three or more? “One another” is the traditional choice, though “each other” is also acceptable in modern English.
3. Place the pronoun after the verb or preposition. “They emailed each other.” / “They laughed at one another’s jokes.”
4. Check formality. In formal writing, follow the two-versus-many rule. In casual conversation, either phrase is fine.
5. Double-check the verb. The verb stays plural because the subject is plural: “The students help each other,” not “helps.”

Examples in Sentences

• The two brothers borrowed each other’s jackets without asking.
• My best friend and I text each other every morning.
• The members of the book club send one another recommendations every month.
• All the neighbours greet one another politely in the elevator.
• The twins finished each other’s sentences during the interview.
• The five committee members respect one another’s opinions.
• After the argument, the couple apologised to each other and made up.
• The players on the team encourage one another before every game.
• My roommate and I share each other’s food all the time.
• The delegates exchanged business cards with one another at the conference.
• The two dogs chased each other around the garden.
• In a healthy community, people listen to one another with patience.

Common Mistakes

• Using a singular verb:
  ❌ Each other knows the answer.
  ✅ They know each other well.
• Adding “themselves” or “together”:
  ❌ They helped each other themselves.
  ✅ They helped each other.
• Forgetting the apostrophe in possessives:
  ❌ They borrowed each others books.
  ✅ They borrowed each other’s books.
• Using them as subjects:
  ❌ Each other are good friends.
  ✅ They are good friends to each other.
• Using them for one-way actions:
  ❌ The teacher praised each other.
  ✅ The teacher praised the students, and the students praised each other.

Quick Summary

• Each other → traditionally two people or things.
• One another → traditionally three or more; more formal in tone.
• Both are reciprocal pronouns and always act as objects, never subjects.
• Possessive forms: each other’s / one another’s.
• Modern English is flexible, but formal writing still prefers the traditional rule.
• Never add “themselves” or “together” after these pronouns.

Practice Exercises

Fill in the blanks with each other, one another, or the possessive forms.

1. The two cats wash ______ every morning.
2. The ten volunteers shared ______ phone numbers before the event.
3. My sister and I often borrow ______ clothes.
4. The students in the large class help ______ with homework.
5. After the match, the two captains shook hands with ______.

Answers:

1. each other
2. one another’s
3. each other’s
4. one another
5. each other

Conclusion

Mastering “each other” and “one another” is easier than it looks: use “each other” for two, “one another” for three or more in formal writing, and relax a little in everyday conversation. With the rules and examples above, you can now express reciprocal relationships with confidence. Keep practising, and these pronouns will soon feel completely natural!

FAQ

1. Can I use “each other” for more than two people?

Yes. In modern English, especially in informal speech and writing, “each other” is widely used for groups of any size. Many style guides now accept it. However, in formal academic or business writing, the traditional rule — “each other” for two, “one another” for three or more — is still preferred and will make your writing look more polished.

2. Is “one another” more formal than “each other”?

Generally, yes. “One another” often appears in formal writing, speeches, and literature, while “each other” dominates everyday conversation. This is a matter of style rather than strict grammar, so choose based on your audience and the tone of your text.

3. What is the difference between “each other” and “themselves”?

“Each other” is reciprocal: it shows mutual action going in both directions, as in “They helped each other” (A helped B, and B helped A). “Themselves” is reflexive: the subject acts on itself, as in “They hurt themselves” (each person hurt himself or herself). The meanings are different, so do not mix them up.

4. How do I form the possessive of “each other” and “one another”?

Simply add an apostrophe and an “s” after the full phrase: “each other’s” and “one another’s.” For example: “The colleagues respect each other’s time” and “The nations value one another’s traditions.” Note that the apostrophe comes before the “s” because the pronoun is singular in form, even though the meaning is plural.