--- title: "Hyphens for Compound Words and Prefixes" description: "Use hyphens to avoid ambiguity in compound modifiers and prefixed words, distinguishing between meanings that change based on hyphen placement" canonical: https://lightmysky.com/learn/english/hyphens-for-compound-words-and-prefixes-mt_QpmVikVaqY source: https://lightmysky.com/learn/english/hyphens-for-compound-words-and-prefixes-mt_QpmVikVaqY.md retrieved: 2026-11-12 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # Hyphens for Compound Words and Prefixes Use hyphens to avoid ambiguity in compound modifiers and prefixed words, distinguishing between meanings that change based on hyphen placement Subject: English · Area: Grammar & Punctuation · Ages 10 to 11 Page: https://lightmysky.com/learn/english/hyphens-for-compound-words-and-prefixes-mt_QpmVikVaqY ## Ready when they can - Distinguish between 'man eating shark' and 'man-eating shark' by adding or removing hyphens - Use hyphens with prefixes to clarify meaning such as 'recover' versus 're-cover' - Apply hyphens correctly in compound adjectives before nouns such as 'well-known author' ## Lesson: Hyphens That Change the Meaning A noun names a person, place or thing. Describing words tell us more about it. A hyphen is the short line in 'well-known'. It can join words that work together to describe a noun. This is a compound modifier. Many take hyphens before a noun: 'a well-known painter', 'a fast-moving river', 'a blue-eyed rabbit' and 'a kind-hearted neighbour'. Separate descriptions stay apart, as in 'a large green leaf'. *(drawing: A man-eating shark is a shark that eats people. The noun shark stays outside the hyphenated description.)* **Example.** 'A man eating shark' describes a man eating shark meat. 'A man-eating shark' describes a shark that eats people. 'A small-business owner' owns a small business; without the hyphen, small might be read as describing the owner. 'A little-used path' is rarely used; without the hyphen, little might describe the path's size. A prefix goes at the start of a word. The prefix re- can mean again. A hyphen can make that meaning clear. Recover can mean to get better or get something back. To make 'cover again' clear, use re-cover with a hyphen. Someone might recover after an illness, recover a missing object, or re-cover a cushion with new cloth. Before a noun, join the parts of an age or measurement and use a singular unit: 'a seven-year-old child', 'a three-metre-long plank'. After the noun, use spaces and a plural unit when the number is greater than one: 'the child is seven years old', 'the plank is three metres long'. Also write 'an up-to-date timetable', but 'the timetable is up to date'. Resign means to leave a job; re-sign means to sign again. A coach might resign from a team, while a musician might re-sign a contract. Reform means to change something to improve it, such as reforming school rules. Re-form means to form again, such as a band re-forming after a break. Choose the spelling that fits the meaning. Some compounds change after the noun: 'a well-known painter', but 'the painter is well known'. Follow that pattern for well known here. Others keep their hyphen: 'the style is old-fashioned'. Check a dictionary if you are unsure. Do not put a hyphen between an adverb ending in -ly and the word it describes: 'a neatly folded towel'. Neatly tells how the towel was folded. Hyphens join parts within words or compound descriptions. They do not separate two complete sentences. 'The rain stopped' and 'We went out' each give a whole thought. Write 'The rain stopped. We went out.' with a full stop between the sentences, not a hyphen. **Recap.** A hyphen joins words into one idea, so where you put it, or whether you use one at all, can completely change what a sentence means. *Original hyphen teaching and practice material written for this dataset.* ## Practice 24 questions on this page, each with its working shown. ## Needs first - [Compound Words](https://lightmysky.com/learn/english/compound-words-mt_70Ys4i1AB1) ## Optional connections - [Expanded noun phrases](https://lightmysky.com/learn/english/expanded-noun-phrases-mt_cU3LcEVkBQ) ## Opens up - [Applying spelling rules to complex words](https://lightmysky.com/learn/english/applying-spelling-rules-to-complex-words-mt_4PA9IrxtCQ)