What Is an Adjective Clause?An adjective clause is a multi-word adjective that includes a subject and a verb. For example:
- The painting we bought last week is a fake.
Table of Contents
- Interactive Examples of Adjective Clauses
- More Examples of Adjective Clauses
- The Components of an Adjective Clause
- The Relative Pronoun Can Be Omitted
- Why Adjective Clauses Are Important
- Test Time!
Interactive Examples of Adjective ClausesHere are some interactive examples to help explain the difference between single-word adjectives, adjective phrases, adjectival phrases, and adjective clauses. In each adjective clause, the subject is blue, and the verb is green. (Also, in each adjective phrase, the head adjective is shown in bold.)
More Examples of Adjective ClausesHere are some more examples of adjective clauses:
- The carpets that you bought last year have rotted.
- The follies which a man regrets most in his life are those which he didn't commit when he had the opportunity. (US journalist Helen Rowland, 1876-1950) (Even though this is a quotation by an American journalist, nowadays, most writers in the US would use that instead of which. There's more on this below.)
- Bore: a person who talks when you wish him to listen.
The Components of an Adjective ClauseAn adjective clause (also called a relative clause) will have the following three traits:
- Trait 1. It will start with a relative pronoun (who, whom, whose, that, or which) or a relative adverb (when, where, or why). (This links it to the noun it is modifying.)
- Trait 2. It will have a subject and a verb. (These are what make it a clause.)
- Trait 3. It will tell us something about the noun. (This is why it is a kind of adjective.)
(Note: Quite often, the relative pronoun can be omitted. However, with an adjective clause, it is always possible to put one in. There is more on this below.)
The Relative Pronoun Can Be OmittedIt is common for the relative pronoun to be omitted. Look at these examples:
- The carpets
whichyou bought last year have gone moldy.
- The film
whichyou recommended scared the kids half to death.
- The follies
whicha man regrets most in his life are those whichhe didn't commit when he had the opportunity. (Helen Rowland, 1876-1950)
- Bore: a person
whotalks when you wish him to listen.
- I don't remember a time when words were not dangerous. (Libyan author Hisham Matar) (You can often omit a relative pronoun, but you can't omit a relative adverb. So, you can't omit when in this example.)
(Question 1) Should I use a comma before which?This is by far the most common question related to adjective clauses. The answer applies to all adjective clauses, not just those that start with which.
So, do you offset an adjective clause with commas or not? The answer is sometimes yes and sometimes no. The rule is this:
- Don't use commas if your clause is essential; i.e., it is required to identify its noun. (This is called a restrictive clause.)
- Do use commas if your clause is just additional information. (This is called a non-restrictive clause.)
- My brother, who claimed to have a limp, sprinted after the bus. (This clause is not required to identify My brother. It is just additional information.)
- My brother (who claimed to have a limp) sprinted after the bus. (As it's just additional information, you can put it in brackets.)
- My brother sprinted after the bus. (As it's just additional information, you can even delete it.)
- The tramp who claimed to have a limp sprinted after the bus. (This clause is required to identify The tramp. Without it, we don't know which tramp we're talking about.)
- The tramp (who claimed to have a limp) sprinted after the bus. (This sentence is only appropriate if we know which tramp we're talking about.)
- The tramp sprinted after the bus. (This sentence is only appropriate if we know which tramp we're talking about.)
(Question 2) What's the difference between that and which?Which and that are interchangeable, provided we're talking about which without a comma.
When which starts a restrictive clause (i.e., a clause not offset with commas), you can replace it with that. In fact, Americans will insist you use that instead of which for a restrictive clause.
- Mark's dog which ate the chicken is looking guilty. (but in America or at least widely disliked) (Americans baulk at which without a comma. They insist on that.)
- Mark's dog that ate the chicken is looking guilty. (This version is acceptable for all. It will stop you getting hate mail from Americans.)
The "that substitution" trick also works with who, but be aware that some of your readers might not like that used for people.
- The burglar who is suing the homeowner was booed in court.
- The burglar that is suing the homeowner was booed in court. (Substituting who for that is a good way to test whether an adjective clause needs commas or not, but some of your readers might not like that being used for a person – even a burglar. So, if your clause starting who sounds okay with that, then revert to who without commas.)