“Maybe the meeting will be cancelled.” “The meeting may be cancelled.” Both sentences are correct — but the two words are not interchangeable, and swapping them is one of the most common errors in learner English. The good news: a single ten-second test settles it every time, and this article gives it to you.
Maybe vs May Be: The Short Answer
Use maybe (one word) when you mean “perhaps” — it’s an adverb. Use may be (two words) when you mean “might be” — it’s a verb phrase (Dictionary.com). The replacement test: if you can swap in possibly or perhaps, write maybe; if you can swap in might be, write may be. In fact, maybe derives from squishing the two words together, which is why they sound identical — and why the confusion never ends.
What Is “Maybe”?
Maybe is a single-word adverb meaning “perhaps” or “possibly.” It expresses uncertainty or possibility, and it typically appears at the start of a sentence or clause, or before the main verb:
- “Maybe we’ll go to the beach this weekend.” (Perhaps we’ll go.)
- “She’s maybe the best player on the team.” (She’s perhaps the best.)
- “Maybe it rains, maybe it doesn’t — bring an umbrella either way.”
As an adverb, maybe modifies the whole sentence. It doesn’t need a helping hand from other verbs — it just sits there, quietly casting doubt over everything that follows. It’s one of the first uncertainty words learners pick up, and one of the most frequently misplaced: it almost never belongs in the middle of a verb phrase.
Maybe also has a lesser-known second life as an informal noun: “It’s a maybe,” “Give me a definite yes or no, not a maybe.” This noun sense is conversational and worth knowing, but it’s a footnote — the adverb is the star of the show, and it’s the one the replacement test covers.
What Is “May Be”?
May be is two words: the modal verb may plus the verb be. Together they function as a verb phrase meaning essentially “might be” (Dictionary.com). Where maybe paints the whole sentence with uncertainty, may be expresses possibility about the subject — it’s doing real grammatical work as the predicate:
- “The train may be delayed.” (The train might be delayed.)
- “This may be the hardest exam of the semester.” (This might be the hardest.)
- “They may be waiting outside already.”
Notice the structure: subject + may be + complement. The two words are a team — may carries the possibility, be links to the description. Remove either one and the sentence breaks: “The train maybe delayed” is wrong (adverb stranded where a verb should be), and “This may the hardest exam” is nonsense (missing the verb entirely).
Like each vs every, this pair rewards attention to word boundaries — English hides real grammatical differences in the gap between two words. And if small pairs trip you up, affect vs effect is the classic next battle.
The Replacement Test: Your Ten-Second Rule
This is the whole article in one paragraph, and it’s the technique Dictionary.com’s explainer centers on. When you’re unsure, try both replacements:
- Swap in “perhaps” or “possibly.” If the sentence still works, you want the one-word adverb maybe. “Maybe she’ll call” → “Perhaps she’ll call” — works, so maybe is correct.
- Swap in “might be.” If the sentence still works, you want the two-word verb phrase may be. “She may be calling” → “She might be calling” — works, so may be is correct.
Run it on the tricky ones:
- “It ___ a trap.” → “It might be a trap” works; “It perhaps a trap” doesn’t. Answer: may be.
- “___ we’ll see you there.” → “Perhaps we’ll see you there” works; “Might be we’ll see you there” is broken. Answer: maybe.
- “This ___ your best option.” → “This might be your best option” — clean. Answer: may be.
The test never fails because the two constructions genuinely can’t substitute for each other. If one replacement works, the other can’t — English is strict about this one. Practice it on five sentences and it becomes reflex.
Common Mistakes
Mistake 1: Writing “may be” where “maybe” belongs. “May be he’ll come” is the classic error — the speaker wants the adverb “perhaps” but splits it in two. Run the test: “Perhaps he’ll come” works, so it’s maybe. This mistake is especially common because the words sound identical in speech.
Mistake 2: Writing “maybe” where “may be” belongs. “This maybe true” is wrong for the mirror reason — the sentence needs a verb phrase (“might be true”), not an adverb. “This might be true” passes the test; “This perhaps true” collapses. Answer: may be.
Mistake 3: Overthinking it. Learners sometimes memorize elaborate rules about modal verbs and adverb placement. You don’t need them. The replacement test — perhaps/possibly vs might be — resolves every case. If both seem to work, read the sentence again; one of them is smuggling in a different meaning.
Mistake 4: Forgetting the noun sense. In casual speech, “That’s a big maybe” is perfectly natural — maybe as a noun meaning “an uncertain answer.” Don’t “correct” it to “may be”; the noun sense is established informal English. It’s just not what this article’s rule is about.
Frequently Asked Questions
Maybe (one word) is an adverb meaning “perhaps” or “possibly.” May be (two words) is a verb phrase meaning “might be.” Use the replacement test: “perhaps” → maybe; “might be” → may be. They sound identical but are grammatically different words.
Yes. “Maybe” here means “perhaps” — the replacement test gives “Perhaps he will come,” which works. The one-word adverb is correct at the start of the sentence.
Yes. “May be” is the modal verb may plus be, meaning “might be raining.” The test: “It might be raining” works, so the two-word form is correct. “It maybe raining” would be wrong.
Because maybe derives from squishing may be together — they share the same sounds and a common ancestor. In speech there’s no difference at all; the confusion only appears in writing, where the one-word/two-word boundary matters.
Yes, informally: “It’s a maybe,” “Give me a yes, not a maybe.” In this sense it means “an uncertain answer.” It’s conversational English — fine in speech and casual writing, but not the adverb sense this rule is about.
Both are fully standard. May be appears constantly in formal writing (“This may be the most important finding”), and maybe is acceptable in all but the most formal registers, where “perhaps” or “possibly” are often preferred. Neither is slang; both are correct English when used in the right slot.
