Adjectives of purpose tell us what something is used for, as in a sleeping bag, running shoes, or a dining table. The term is common in traditional grammar lessons, although words expressing purpose are not always adjectives.
What Are Adjectives of Purpose?
In running shoes, the word running tells us what the shoes are designed for. It doesn’t describe an action the shoes are performing.
The same idea applies to other familiar expressions:
We packed two sleeping bags for the trip.
She bought new running shoes.
The restaurant replaced its dining tables.
Traditional grammar lessons often group these words under adjectives of purpose, particularly when teaching adjective order.
In modern grammatical descriptions, however, combinations such as sleeping bag and running shoes are often treated as compound nouns rather than ordinary adjective-and-noun phrases.
The traditional label is useful for understanding what these expressions mean, but it doesn’t always identify the grammatical class of the word before the noun.
How English Expresses Purpose
English expresses purpose in a couple of familiar ways.
-ing Modifiers Before Nouns
You’ll often see -ing in names such as cutting board, fishing rod, and swimming pool.
She placed the vegetables on a cutting board.
The hotel has a heated swimming pool.
He packed a fishing rod for the weekend.
These words help name objects or places associated with a particular activity.
But the pattern doesn’t work with every verb. English has its own familiar combinations. For example, we normally say storage box, not storing box.
Nouns Used as Purpose Modifiers
Other expressions don’t need an -ing word at all.
She put the winter clothes in a storage box.
The coach ordered new tennis rackets.
They installed a shoe rack near the entrance.
Here, storage, tennis, and shoe are nouns used to modify another noun.
Not every noun modifier expresses purpose. A glass bottle identifies material, while a history book identifies subject matter.
What the two nouns mean together makes the difference.
Common Purpose Expressions With Examples
The following expressions name objects, equipment, or places associated with particular uses.
| Purpose expression | Typical use |
|---|---|
| Sleeping bag | Sleeping in, especially outdoors |
| Running shoes | Running |
| Dining table | Eating meals |
| Cutting board | Cutting food |
| Washing machine | Washing clothes |
| Swimming pool | Swimming |
| Reading lamp | Providing light for reading |
| Writing desk | Writing or desk work |
| Gardening gloves | Protecting hands while gardening |
| Cooking pot | Cooking food |
| Frying pan | Frying food |
| Fishing rod | Fishing |
| Sewing machine | Sewing fabric |
| Measuring cup | Measuring ingredients |
| Charging cable | Charging devices |
| Storage container | Storing items |
| Training room | Conducting training activities |
| Tennis racket | Playing tennis |
| Shoe rack | Holding or organizing shoes |
| Bicycle helmet | Protecting the head while cycling |
It’s more useful to learn these as complete expressions because words such as running and training can mean different things in other contexts.
An object’s usual purpose also doesn’t have to match what someone is doing with it at the moment.
He wore his running shoes to the supermarket.
They’re still running shoes, even at the supermarket.
Purpose or Description? Understanding -ing Modifiers
A sleeping baby and a sleeping bag both contain the word sleeping, but it does a different job in each expression.
The sleeping baby woke up.
She unrolled her sleeping bag.
In the first sentence, sleeping describes the baby’s condition. In the second, it identifies a type of bag.
The distinction appears in other expressions too.
| Expression | What the modifier tells us |
|---|---|
| a sleeping baby | The baby is asleep. |
| a sleeping bag | The bag is intended for sleeping in. |
| running water | The water is flowing. |
| running shoes | The shoes are designed for running. |
| a leaking pipe | The pipe is leaking. |
| a measuring cup | The cup is used for measuring ingredients. |
The words may look the same, but they aren’t doing the same job.
Not every -ing + noun expression describes either an object’s purpose or something happening to it.
For example:
She attended a swimming lesson.
Here, swimming identifies the activity being taught, rather than the purpose of a piece of equipment.
Similarly, a marketing seminar is a seminar about marketing. The first word identifies its subject matter.
Purpose Words in Adjective Order
Purpose expressions usually stay close to the noun. We naturally say a comfortable sleeping bag or a wooden dining table because sleeping bag and dining table are familiar names for objects.
Consider these examples:
They bought a comfortable sleeping bag.
The family gathered around a wooden dining table.
She ordered a large plastic storage box.
Traditional adjective-order lessons place purpose near the end of the sequence, generally after material.
However, expressions such as sleeping bag and dining table often work as established names for types of objects. The words belong together rather than behaving like freely added descriptive adjectives.
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