What are 'where' and 'when' in relative clauses?
'Where' and 'when' are relative adverbs that introduce relative clauses. They connect additional information about a place or time to the main sentence. Instead of using 'that' or 'which' with a preposition, we can use 'where' and 'when' to make sentences more natural and concise. These adverbs are very common in everyday English and help us describe locations and moments more smoothly.
Using 'where' for places
Use 'where' to introduce a relative clause about a place or location. The clause gives more information about a noun that refers to a place. You can think of 'where' as replacing 'in which,' 'at which,' or 'that.' For example: 'The restaurant where we had dinner was excellent' means the same as 'The restaurant in which we had dinner was excellent.' The 'where' clause helps us avoid awkward prepositions and makes the sentence flow better.
Using 'when' for times
Use 'when' to introduce a relative clause about a time or moment. The clause describes when something happened or a specific period. 'When' can replace 'at which,' 'on which,' or 'that' in time expressions. For example: 'The day when I arrived was very hot' is the same as 'The day on which I arrived was very hot.' Using 'when' makes your writing clearer and more natural, especially when talking about moments, days, years, or periods.
Where vs When: Side-by-Side Comparison
| Aspect | WHERE in Relative Clauses | WHEN in Relative Clauses |
|---|---|---|
| Form | Relative adverb where introduces a clause that modifies a place noun. It functions as an adverb of place within the relative clause. | Relative adverb when introduces a clause that modifies a time noun. It functions as an adverb of time within the relative clause. |
| Noun Types Modified | Modifies nouns referring to places or locations, e.g. city, country, room, street, building, office, park, town, village, school, house. | Modifies nouns referring to times or periods, e.g. day, year, moment, time, era, period, season, decade, century, occasion, night. |
| Preposition Phrase Replaced | where replaces a prepositional phrase of place such as in which, at which, on which, to which when referring to a location. Example: the city in which she grew up → the city where she grew up |
when replaces a prepositional phrase of time such as in which, on which, at which, during which when referring to a time. Example: the year in which he was born → the year when he was born |
| Positive Example | 1. This is the café where we first met. 2. She returned to the village where she had spent her childhood. 3. The hospital where he works is world-famous. |
1. I remember the day when we first met. 2. Spring is the season when flowers bloom. 3. That was the moment when everything changed. |
| Negative Example | 1. This is the town where they do not speak English. 2. He moved to a country where there are no harsh winters. 3. Find me a place where no one can disturb us. |
1. There was a time when phones did not exist. 2. I recall the evening when the lights did not come on. 3. That was the decade when people could not travel freely. |
| Question Example | 1. Is this the museum where the painting was stolen? 2. Can you show me the office where the meeting will take place? 3. Do you know the street where she lives? |
1. Do you remember the night when we saw the meteor shower? 2. Was there ever a time when you felt completely at peace? 3. Can you recall the year when the company was founded? |
| Key Signal Words (Antecedents) | place, city, town, country, house, room, street, restaurant, school, office, park, building, location, area, region, neighbourhood, world, land | time, day, year, moment, period, era, occasion, season, century, decade, night, afternoon, morning, age, hour, instant, phase |
| Omission Rule | where generally cannot be omitted from the relative clause without restructuring the sentence (a preposition must then be added): the city where she lives → the city (that/which) she lives in. | when can often be omitted in informal English, leaving the noun and clause adjacent: the day when we met → the day we met (both are correct and natural). |
| Defining vs. Non-Defining Use | Defining: The park where children play is nearby. Non-defining (commas): Paris, where she studied art, is beautiful. |
Defining: The summer when it never rained was 1976. Non-defining (commas): Last July, when we visited Rome, was unforgettable. |
| 🔑 Key Difference: The choice between where and when is determined entirely by the type of noun (antecedent) being modified. Use where when the antecedent refers to a place or location — it answers the question "where?" within the clause. Use when when the antecedent refers to a time or period — it answers the question "when?" within the clause. A quick test: if you can replace the relative clause with "there", use where; if you can replace it with "then", use when. | ||
Formula
Formula
Noun (place)
+
where
+
subject + verb
The school where my children study is near our house.
Examples
The city where I was born is very beautiful.
Place description · Relative clause with 'where'
Do you remember the moment when we first met?
Time description · Relative clause with 'when'
The hotel where we stayed had an excellent view of the ocean.
Everyday usage · Describing accommodation
I'll never forget the night when she told me the secret.
Narrative · Past event description
The library where my son studies is very quiet.
Location description · Present situation
Summer is the season when everyone loves to travel.
General time · Seasonal reference
When to use it
Describing places
Use 'where' to give information about locations, buildings, or geographical areas without needing prepositions.
"The apartment where they live has three bedrooms."
Describing moments
Use 'when' to connect time references to events or situations you want to explain further.
"The day when he called me was the happiest day of my life."
Academic writing
Both 'where' and 'when' are essential in formal writing to provide context clearly.
"The university where she taught is one of the oldest in Europe."
Storytelling
These relative adverbs help narrate stories by setting the scene and timeline naturally.
"It was the summer when everything changed for our family."
Signal words
where (for places)
when (for times)
the place where
the city where
the moment when
the day when
the time when
the year when
Common Mistakes
✕
Wrong
The restaurant which we ate was very expensive.
✓
Correct
The restaurant where we ate was very expensive.
'Where' is better for places. Using 'which' requires a preposition: 'in which we ate.'
✕
Wrong
The morning when I arrived, it was raining hard.
✓
Correct
The morning when I arrived was very rainy.
Avoid double time markers. Don't use 'when' and another time reference in the same clause.
✕
Wrong
This is the office where I work there.
✓
Correct
This is the office where I work.
'Where' already includes location meaning. Don't add 'there' after it.
✕
Wrong
The country where I was living in was Spain.
✓
Correct
The country where I was living was Spain.
'Where' already contains the preposition 'in.' Don't repeat it.
KEY TAKEAWAYS
What to Remember
- Use 'where' to introduce relative clauses that add information about a place or location.
- Use 'when' to introduce relative clauses that add information about a specific time or moment.
- 'Where' and 'when' replace the need for 'that' or 'which' plus a preposition for clarity.
- 'Where' and 'when' make sentences more natural and concise than using prepositions with other relative pronouns.
- Both 'where' and 'when' are relative adverbs that connect additional details smoothly to the main sentence.