Look at these examples to see how non-defining relative clauses are used.
Jack, who's retired now, spends a lot of time with his grandchildren.
We want to see the new Tom Carter film, which was released on Friday.
My sister, whose dog I'm looking after, is visiting a friend in Australia.
Try this exercise to test your grammar.
Read the explanation to learn more.
Grammar explanation
Relative clauses give us information about the person or thing mentioned.
Non-defining relative clauses give us extra information about someone or something. It isn't essential for understanding who or what we are talking about.
My grandfather, who's 87, goes swimming every day.
The house, which was built in 1883, has just been opened to the public.
The award was given to Sara, whose short story impressed the judges.
We always use a relative pronoun or adverb to start a non-defining relative clause: who, which, whose, when or where (but not that). We also use commas to separate the clause from the rest of the sentence.
who, which and whose
We can use who to talk about people, which to talk about things and whose to refer to the person or thing that something belongs to.
Yesterday I met my new boss, who was very nice.
The house, which is very big, is also very cold!
My next-door neighbour, whose children go to school with ours, has just bought a new car.
After the port there is a row of fishermen's houses, whose lights can be seen from across the bay.
Places and times
We can use which with a preposition to talk about places and times. In these cases it's more common to use where or when instead of which and the preposition.
City Park, which we used to go to, has been closed down.
City Park, where we used to go, has been closed down.
December, which Christmas is celebrated in, is a summer month for the southern hemisphere.
December, when Christmas is celebrated, is a summer month for the southern hemisphere.
However, when we use which without a preposition, we can't use where or when.
Centre Park, which we love, is always really busy on Saturdays.
February, which is my favourite month, lasts 29 days this year.
Do this exercise to test your grammar again.
Hello MaryPoury,
When you have a sentence with the relative pronoun which and a preposition (e.g. in which, on which, etc) it is often possible to use the relative adverbs when or where instead. If you use when or where then you do not need a preposition.
In your sentences you use the relative adverbs when and where and so no preposition is needed. If you use the relative pronoun which instead then you need to add a preposition:
Winter, when temperatures are lower, sees higher rainfall. [relative adverb; no preposition needed]
When we use which with no preposition, we cannot replace it with when or where:
Peter
The LearnEnglish Team
Hello Ali Reza
We plan to create an Advanced grammar at some point, but I'm afraid it's going to be quite some time before we have it ready. In the meantime, the Grammar Reference has advanced points on many pages.
There are also other free resources on the internet, e.g. the Cambridge Dictionary, where you can find quite a lot of material.
Since the TOEFL isn't used by British institutions, we do not plan to create any resources for it.
All the best
Kirk
The LearnEnglish Team
Hello Ali Reza
These two sentences have the same meaning.
All the best
Kirk
The LearnEnglish Team
Hello Kaisoo93
Non-defining relative clauses are not reduced like defining clauses are, so, for example, sentences 2 and 3 are not correct. 1 is correct, though it's not a case of a reduced non-defining clause -- instead it is an example of apposition.
All the best
Kirk
The LearnEnglish Team