Preposition IN — When and How to Use It

ByKhamis Maiouf
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Quick Answer

Use in when something is inside a space — a box, a room, a country, a bag. If you can imagine walls or sides around it, use in.

Example: The book is in the bag. (The book is inside the bag.)

IN in Action — See the Pattern

Read these three sentences. Look at how in works:

  • The keys are in my pocket. (The keys are inside the pocket.)
  • She lives in London. (London is a place — she is inside it.)
  • There is milk in the cup. (The milk is inside the cup.)

When to Use IN

Use in when something is surrounded by walls, sides, or a border. Think of a container — anything that can hold something else.

  • Inside a room: “My phone is in the kitchen.”
  • Inside a container: “The cookies are in the jar.”
  • Inside a place on the map: “Tokyo is in Japan.”
  • Inside a vehicle (car, taxi): “He is in the car.”

Remember: a bag, box or room helps you picture in. We also use in for places such as a city or garden; they do not need a lid or walls.

The rule for these examples: use in for a position inside a container or within a place.

Real-Life Examples With IN

Here are examples you might say or hear in everyday life:

  • My passport is in the drawer. (Inside the drawer; the drawer can be open or closed.)
  • She works in a hospital. (She is inside the hospital building when she works.)
  • There are eggs in the fridge. (The eggs are inside the fridge.)
  • I was born in Brazil. (Brazil is a country — you are inside its borders.)
  • Your jacket is in the wardrobe. (Inside the wardrobe.)

Now compare the examples below. Check the location described before you choose a preposition.

Three Mistakes to Avoid With IN

These examples describe something inside a place or container. A different preposition can be grammatical when it describes a different location.

Using on when something is inside

✗ I have ten dollars on my wallet.
✓ I have ten dollars in my wallet.

Using at for inside a place

✗ She is at the room.
✓ She is in the room.

Forgetting in for countries and cities

✗ He lives to Spain.
✓ He lives in Spain.

How to remember: Picture a box. The thing is inside the box → it is in the box.

Other places we usually say “in”: in a car, in a hospital, in a city, in the kitchen, in the garden.

Test Yourself: IN

Choose an answer to see your feedback immediately. Your first answer counts towards your score.

Question 1 of 5

1. The cat is inside the box. The cat is _______ the box.

2. The bottle holds water inside it. There is water _______ the bottle.

3. My sister has her home in Paris. She lives _______ Paris.

4. The children are inside the classroom. They are _______ the classroom.

5. She put the key inside her bag. She put the key _______ her bag.

You know how to use in. Compare it with on, under and next to in the guide to prepositions of place.

Keep Going — You Are Building Something

You have practised in with containers and places. Write three sentences about things in your room.

But here is a question: if I have a book in the bag, where is the bag? Probably on the table. “In” and “on” sound similar but they are not the same. Do you know exactly when to use on?

Next lesson: Preposition ON — When and How to Use It

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