Every day you talk about things that belong to people: your manager's email, your friend's birthday, your doctor's phone number. English has two tools for this: the little 's ("Maria's phone") and the "of" phrase ("the door of the building"). Choosing well makes you sound natural; choosing badly makes simple sentences feel heavy. "The car of my brother" is understandable, but every native speaker would say "my brother's car".

The choice also carries meaning. "'s" is the normal way to show that a person owns or is connected to something. "Of" is the normal way to talk about parts of things and long descriptions. Using the right one for the right job keeps your sentences short, clear, and easy to follow — in speech, in texts, and in work emails.

Start with the form of the possessive. For one owner, add apostrophe + s to the owner's name or noun: "Maria's phone", "the teacher's desk", "my boss's office". Note the order: the owner comes first, the thing comes second — the opposite of "of". For a regular plural owner, the "-s" is already there, so just add the apostrophe after it: "my parents' house", "the students' books". For irregular plurals like "children" and "men", add 's as usual: "the children's toys", "the men's room".

Use 's mainly with people and animals: "Anna's sister", "the dog's bowl", "my colleague's idea". It also works with groups of people ("the company's plan", "the team's decision") and with time words ("today's meeting", "next week's schedule", "an hour's drive"). These time possessives are very common in work English.

Use "of" for things and their parts: "the end of the film", "the top of the page", "the corner of the street", "the back of the car". A door does not own a handle the way a person owns a phone, so English prefers "the handle of the door" — or, even more often, a compound like "the door handle". Also choose "of" when the owner phrase is long: "the house of the family who moved here last year" reads better than pushing a long phrase in front of 's.

So the practical decision is quick. Ask: is the owner a person (or group of people, or a time word)? Use 's and put the owner first. Is it a thing, a part, or a long description? Use "of" and put the thing first. Both patterns can be correct for the same idea sometimes, but this rule of thumb gives you the natural choice almost every time.

One more useful trick: 's can stand alone when the thing is understood. "Whose keys are these?" — "They're David's." You do not need to repeat "keys". You will also hear it with shops and homes: "I'm at the doctor's", "We had dinner at Lena's". The noun after 's is simply dropped because everyone knows what it is.

1. 1. My sister's apartment is near the station.

   One owner (a person): add 's and put the owner first.

2. 2. The manager's decision surprised everyone at work.

   's works for people at work, not just family and friends.

3. 3. Is this James's jacket or yours?

   Names ending in "-s" usually still take 's: "James's".

4. 4. My parents' garden looks beautiful in spring.

   Plural owner ending in "-s": the apostrophe goes after the s.

5. 5. The children's shoes are by the front door.

   Irregular plural "children" takes a normal 's.

6. 6. The dog's bed needs washing again.

   Animals take 's, just like people.

7. 7. The price of the ticket includes breakfast.

   A thing and its feature: "of" is the natural choice.

8. 8. Write your name at the top of the form.

   Parts of things — top, bottom, end, side — use "of".

9. 9. The end of the movie made me cry.

   "The movie's end" is possible but "the end of" sounds natural.

10. 10. Today's meeting starts at ten o'clock.

    Time words like "today" and "next week" can take 's.

11. 11. It's about an hour's drive to the coast.

    Lengths of time also use 's: "an hour's drive".

12. 12. Whose umbrella is this? It's Tom's.

    After 's you can drop the noun when it is understood.

13. 13. I have an appointment at the dentist's tomorrow.

    "The dentist's" means the dentist's clinic — the place is dropped.

14. 14. The name of the hotel we stayed at was long.

    The owner phrase is long, so "of" keeps the sentence clear.

The most common mistake is using "of" for a person: "the phone of Maria", "the car of my brother". These are grammatical but sound foreign and heavy, because English strongly prefers 's for people: "Maria's phone", "my brother's car". Many learners do this because their first language builds ownership with an "of"-style word. Train the opposite habit: person first, then 's, then the thing.

The second mistake area is the apostrophe itself. Learners write "my parents's house" or "the girls's team" — but a regular plural already ends in "-s", so you only add the apostrophe: "my parents' house", "the girls' team". The mirror error is "the childrens' toys": "children" has no "-s", so it takes a normal 's — "the children's toys". And be careful with "it": "its" (no apostrophe) means possession, while "it's" always means "it is".

The third mistake is forcing 's onto things: "the table's corner", "the door's key", "the page's bottom". These feel odd because things do not usually "own". Say "the corner of the table", "the bottom of the page" — or use a compound noun like "the door key". If the owner is not a person, a group, an animal, or a time word, reach for "of" first.

• People own with 's: "Anna's bag", not "the bag of Anna".
• Parts of things take "of": the top of, the end of, the side of.
• Plural ending in -s? Apostrophe only: "my parents' house".
• Irregular plural? Normal 's: "the children's room", "the men's team".
• Time words can own too: "today's news", "next month's rent".
• "Its" = possession; "it's" = "it is". Never mix them.