missing hyphen in 'no-go'

Missing hyphens can change meaning and make sentences harder to read. Below: quick rules, clear examples you can copy, simple rewrites, and three quick checks to decide whether to hyphenate.

Quick answer: When to add a hyphen

Hyphenate compound modifiers before a noun (a 10-page report). Don't hyphenate an adverb ending in -ly + adjective (a highly regarded team). Hyphenate ages, number+unit compounds before nouns, fixed expressions (no-go, one-on-one), and fractions used adjectivally (a two-thirds majority).

Before a noun = hyphenate (long-term plan → a long-term plan).
After a verb = usually open (the plan is long term).
-ly adverb + adjective = no hyphen (a newly minted writer).
Fixed compounds and ages before nouns = hyphenate (no-go, twenty-four-year-old).

Core rules: the minimum you need to know

If two or more words work together as a single adjective before a noun, use a hyphen. If the same words follow the noun, leave them open.

Compound modifier before noun → hyphenate (well-known movie).
Same words after noun → no hyphen (the movie is well known).
Adverb ending in -ly + adjective → no hyphen (a highly regarded author).

School - Wrong: She is a well known scientist.
School - Right: She is a well-known scientist.
School - Wrong: The scientist is well known.
School - Right: The scientist is well known.

Hyphenation and spacing: closed, hyphenated, and open forms

Compounds can be closed (one word), hyphenated, or open. Wrong spacing can change meaning or look unprofessional.

Closed: one word (nightlife, handbook).
Hyphenated: joins words into a single modifier (one-on-one, no-go).
Open: separate words not acting as a single modifier (high school student).

Wrong: This is a nogo zone.
Right: This is a no-go zone.
Casual - Wrong: I sent you an e mail yesterday.
Casual - Right: I sent you an email yesterday.

Numbers, ages, and fractions: rules that don't change

Hyphenate number + unit when it modifies a noun; hyphenate ages used adjectivally; hyphenate fractions used as adjectives.

Before a noun: hyphenate (10-page report; twenty-four-year-old student).
After a verb: write open (the report is 10 pages long; the student is twenty-four).
Fractions as adjectives: hyphenate (a two-thirds majority).

Work - Wrong: Please deliver a 10 page report tomorrow.
Work - Right: Please deliver a 10-page report tomorrow.
School - Wrong: The twenty four year old student won a scholarship.
School - Right: The twenty-four-year-old student won a scholarship.
Work - Wrong: We need a two thirds majority to pass it.
Work - Right: We need a two-thirds majority to pass it.

Common exceptions you must remember

Don't hyphenate when the modifier follows the noun or when the first word is an -ly adverb. Some compounds are now closed words-check a dictionary or style guide when unsure.

After the noun → usually open (the plan is long term).
-ly adverb + adjective → no hyphen (highly effective strategy).
Some formerly hyphenated terms are closed (email vs e-mail); check usage.

Wrong: A highly-regarded author visited today.
Right: A highly regarded author visited today.
Work - Wrong: The schedule is 3-hour long.
Work - Right: The meeting is three hours long.

Try your own sentence

Test the full sentence rather than the phrase alone. Context often makes the correct choice obvious.

Real usage and register: work, school, casual

In formal writing and contracts, favor hyphens for precision. Casual writing can tolerate some closed forms, but avoid ambiguity-use the hyphen when meaning might be unclear.

Work/Legal = err on the side of hyphenation (no-strings-attached clause).
School/Academic = use hyphens for clarity in descriptions and data.
Casual = common compounds may be closed (email), but keep hyphens when they prevent misreading.

Work - Wrong: We need a long term plan for the launch.
Work - Right: We need a long-term plan for the launch.
School - Wrong: He presented a state of the art device to the class.
School - Right: He presented a state-of-the-art device to the class.
Casual - Wrong: Buy one get one free offer valid this weekend.
Casual - Right: Buy-one-get-one-free offer valid this weekend.

Examples: copyable wrong → right templates

Swap in your nouns or numbers and keep the same hyphen pattern. These are ready to paste into emails, essays, posts, or reports.

Casual - Wrong: This camera has a great close up mode.
Right: This camera has a great close-up mode.
Work - Wrong: I had a one on one meeting with my boss.
Right: I had a one-on-one meeting with my boss.
Work - Wrong: The product is no go for the European market.
Right: The product is a no-go for the European market.
School - Wrong: State of the art research requires collaboration.
Right: State-of-the-art research requires collaboration.
School - Wrong: A ten year plan will be presented tomorrow.
Right: A ten-year plan will be presented tomorrow.
Casual - Wrong: It was a middle class neighborhood.
Right: It was a middle-class neighborhood.
Work - Wrong: He is a fast moving target in negotiations.
Right: He is a fast-moving target in negotiations.
Casual - Wrong: Low cost solution available now.
Right: Low-cost solution available now.
Work - Wrong: A back to back session was scheduled.
Right: A back-to-back session was scheduled.
Work - Wrong: The product launch is a no go.
Right: The product launch is a no-go.
School - Wrong: A two thirds-majority vote was called.
Right: A vote with a two-thirds majority was called.
Casual - Wrong: I had a one on one with my friend.
Right: I had a one-on-one with my friend.

Rewrite help: three easy fixes when hyphens look clunky

Long hyphen chains are hard to scan. Fix them by using of-phrases, relative clauses, or by reordering.

Use of-phrases: "the well-being of the ten-year-old" instead of "the ten-year-old's well-being."
Use who/that clauses: "a student who is twenty-four" instead of "a twenty-four-year-old student" when that reads clearer.
Split adjectives: move some modifiers after the noun or turn one into a short clause.

Rewrite: Awkward: The ten-year-old's well-being was discussed. → The well-being of the ten-year-old was discussed.
Rewrite: Awkward: a long-term, high-impact, company-wide change. → A company-wide change that will be long term and high impact.
Rewrite: Awkward: a two-thirds-majority vote. → A vote with a two-thirds majority.
Rewrite: Awkward: a well-respected, young scientist. → A young scientist who is well respected.

Memory tricks and similar punctuation pitfalls

Three quick checks and a note on dashes will save you time.

Fast test: move the phrase after the verb-if it still sounds right, you probably don't need a hyphen.
Mnemonic: "Before noun = Bond" (hyphen bonds words). After noun = open/free.
Don't confuse hyphen (compound words) with en dash (ranges: 1999-2005) or em dash (break in thought).

Usage: Test: "a well-known author" → after verb: "the author is well known."
Warning: Don't use a hyphen where a range needs an en dash: "1999-2005" (ranges), not "1999-2005" in formal typography.

FAQ

Do I always need a hyphen between numbers and units before a noun?

Yes-when the number+unit functions as a single adjective before a noun (10-page report, three-year warranty). If it follows the noun, write it open (the report is 10 pages).

Is "no go" hyphenated or two words?

"No-go" is preferred when the words form a single idea modifying a noun (a no-go zone). Casual text may show "no go," but the hyphen prevents misreading.

How should I hyphenate ages in essays?

Hyphenate ages when used adjectivally before a noun: a twenty-four-year-old student. After the verb, write it open: the student is twenty-four.

When can I omit a hyphen with adverbs?

If the modifier contains an adverb ending in -ly (e.g., highly regarded), don't hyphenate-the -ly already links the words.

Should I use a dash instead of a hyphen for compound words?

No. Use hyphens for compounds, en dashes for ranges and relations, and em dashes for breaks in thought. Using the wrong dash looks incorrect and can change meaning.

Want sentence-level certainty?

If you're unsure about a sentence, paste it into a quick editor that highlights hyphen issues and shows the rule. Use the rewrite tips above when hyphens make a sentence clunky.