Across vs Over vs Through – What’s the Difference?
Choosing between across vs over vs through is a common challenge for English learners. All three prepositions are used to describe movement and position, and in some situations, they can appear similar. However, they are not interchangeable, and using the wrong one can make your English sound unnatural — or even incorrect.
In this lesson, you’ll learn how to use across, over, and through correctly, with clear explanations, typical contexts, and natural examples. This guide is especially useful for B1–B2 learners and those preparing for Cambridge exams (B2 First / C1 Advanced).
ACROSS
Across usually means from one side to the other on a surface or area.
Movement from one side to the other
Use across when someone or something moves from one side of an area to the opposite side.
- She ran across the street without looking.
- We walked across the bridge in the early morning fog.
- He swam across the river to reach the opposite bank.
Think of across as movement on something, not inside it.
Position covering or stretching from side to side
Across can also describe something that extends from one side to another.
- She folded her arms across her chest.
- A large banner was stretched across the road.
- There were cracks across the wall.
OVER
Over often suggests movement above something, contact from above, or covering.
Movement above or across a higher point
Use over when something passes above an obstacle.
- The plane flew over the city.
- He jumped over the fence.
- Clouds drifted over the mountains.
Covering or resting on top of something
Over can mean covering or lying on something.
- She put a blanket over the child.
- He spilled coffee over the table.
- There was a jacket thrown over the chair.
Time periods (very important for exams)
Use over, not through, when talking about periods of time.
- I haven’t seen her much over the past few months.
- Sales increased over the last decade.
- It took them over three weeks to finish the project.
Incorrect:
❌ through the last three years
❌ through the last three years
THROUGH
Through means movement from one side to the other inside something — a space that surrounds you.
Movement inside an enclosed or surrounding space
Use through when something enters, passes inside, and exits.
- We walked through the forest at dusk.
- The train went through the tunnel.
- She pushed her way through the crowd.
If you are inside the space, through is usually correct.
Penetration or passing within something
Through is also used for light, sound, or physical movement passing inside something.
- Sunlight streamed through the window.
- I could hear voices through the wall.
- He looked through the keyhole.
Completing a process
In more abstract uses, through can mean finishing or surviving something.
- She went through a difficult period.
- We’ve been through a lot together.
- He read through the entire report.
Across vs over vs through – quick comparison
| From one side to the other (surface) |
across
|
| Above or covering |
over
|
| Inside an enclosed space |
through
|
| Periods of time |
over
|
| Crowds, tunnels, forests |
through
|
Common learner mistakes to avoid
- ❌ I walked over the forest → ✅ through the forest
- ❌ I haven’t seen him through the last year → ✅ over the last year
- ❌ She ran through the street → ✅ across the street
These are typical FCE and CAE error-correction traps.
Final tip for exam success
When choosing between across, over, and through, ask yourself:
- Am I moving on a surface? → across
- Am I moving above or covering something? → over
- Am I moving inside or within something? → through
If you train yourself to think this way, these prepositions will stop being confusing — and your writing will immediately become more accurate.
Do the quiz to perfect your knowledge:
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