may be (maybe)

People often confuse maybe (one word, an adverb meaning 'perhaps') with may be (two words, modal + be). Use quick substitution tests and these examples to pick the right form every time.

Quick answer

Use maybe (one word) to mean 'perhaps' and modify a verb, adjective, or whole clause. Use may be (two words) when may is a modal verb and be is the main verb, to say 'it is possible that' about a state or identity.

Test: Try replacing the phrase with perhaps - if it fits, use maybe.
Test: Try replacing it with "it is possible that" - if that works, use may be.
Remember: maybe = adverb (one word). may be = modal + verb (two words).

Core explanation (short)

Maybe is an adverb: it qualifies clauses or verbs (Maybe we'll leave). May be is a verb phrase: the modal may + base verb be expresses a possible fact or condition (She may be late).

maybe = perhaps; moves to the front of the sentence easily.
may be = may + be; tied to the verb and to the subject it comments on.

Spelling, hyphenation & spacing

Maybe is always one word. May be is always two separate words. There is no hyphenated form.

Wrong spacing changes meaning: "She maybe the leader" ≠ "She may be the leader."
If you see "may be" where you expect maybe, check whether the phrase acts like a verb phrase or an adverb.

Real usage: tone and register

Maybe appears often in casual suggestions and softening language. May be appears in neutral or formal statements expressing that something might be true.

Maybe (suggestion/hesitation): "Maybe we should wait."
May be (possibility about a fact): "The meeting may be delayed."
Apply the substitution tests regardless of formality - tone doesn't change the grammar.

Examples (work, school, casual) - wrong / right pairs

Each wrong line shows a common error; the right line gives the correct sentence and a brief reason.

Work:
Wrong: Maybe the client needs more time to approve the draft.
Right: The client may need more time to approve the draft. - (stating a possible fact)
Work:
Wrong: The server may be crashing; maybe restart it.
Right: The server may be crashing; maybe try restarting it. - (may be = possibility; maybe = suggestion)
Work:
Wrong: Maybe we should add a budget line for training.
Right: Maybe we should add a budget line for training. - (
correct: suggestion uses maybe)
School:
Wrong: Maybe the experiment failed because we used impure reagents.
Right: The experiment may have failed because we used impure reagents. - (past possibility: may have + past participle)
School:
Wrong: The narrator maybe unreliable in chapter three.
Right: The narrator may be unreliable in chapter three. - (stating a possible trait)
School:
Wrong: Maybe you should cite a secondary source here.
Right: Maybe you should cite a secondary source here. - (
correct: suggestion)
Casual:
Wrong: You may be like this new song.
Right: Maybe you'll like this new song. - (use maybe for a guess about liking)
Casual:
Wrong: Maybe he's at the café; call him?
Right: He may be at the café; call him? - (stating a possible location)
Casual:
Wrong: I may be free later maybe.
Right: I may be free later; maybe we can meet then. - (separate roles: may be = possibility; maybe = suggestion)
Extra: Wrong: Maybe she the project lead.
Right: She may be the project lead. - (needs modal + be)
Extra: Wrong: Could maybe be true.
Right: It could be true. / Maybe it's true. - (modal + be vs adverb)
Extra: Wrong: Maybe not the best time to call-he may be asleep.
Right: Maybe it's not the best time to call-he may be asleep. - (add a pronoun for clarity)

Try your own sentence

Test the whole sentence, not the isolated phrase. Context makes the correct choice clearer. Paste your sentence into the checker below if you want a second look.

Fix your sentence: checklist and 6 rewrites

Checklist: 1) Replace with perhaps - if it fits, use maybe. 2) Replace with "it is possible that" - if it fits, use may be. 3) Read aloud to confirm verb placement.

If the phrase links to a noun or adjective that names identity/state, it's probably may be.
If the phrase starts a suggestion or can move to the sentence front, it's probably maybe.

Rewrite:
Original: Maybe John responsible for the error.
Rewrite: John may be responsible for the error. - (insert modal + be)
Rewrite:
Original: The system maybe updated overnight; check logs.
Rewrite: The system may have been updated overnight; check the logs. - (past possibility)
Rewrite:
Original: Maybe we missed the meeting because the link broke.
Rewrite: Maybe we missed the meeting because the link broke. / Or: It may be that we missed the meeting because the link broke. - (both acceptable; choose nuance)
Rewrite:
Original: Maybe she the best person for this role.
Rewrite: She may be the best person for this role. - (use modal + be)
Rewrite:
Original: Maybe call IT; the printer won't print.
Rewrite: Maybe call IT-the printer won't print. / Or: The printer may not be working; maybe call IT. - (suggestion vs stated possibility)
Rewrite:
Original: Could maybe be improved.
Rewrite: It could be improved. / Maybe it could be improved. - (restore subject and order)

Memory tricks and edge cases

Memory hooks: maybe ↔ perhaps; may be ↔ it is possible that. Movement test: maybe can begin the sentence (Maybe, we should...), while may be stays with the verb.

Watch these edge cases:

"Maybe not" = adverbial reply (Probably not).
"May not be" = modal negative (It may not be ready).
Past possibility: use may have been (The file may have been deleted).

Related errors and similar mistakes to watch for

Confusing maybe and may be often goes with mixing adverbs and modal verb phrases. Other common pairs:

might be / could be = modal + be (two words) for possibility.
maybe = adverb (one word) for perhaps or suggestion.
Avoid stacking both unnecessarily: "could maybe" is clumsy - choose "It could be" or "Maybe it's."

Compare: Incorrect: Maybe he might be the one. → Better: He might be the one. / Maybe he'll be the one.
Compare: Incorrect: Could maybe be true. → Better: It could be true. / Maybe it's true.

Grammar note

Use may + be for present/future possibility; use may + have + past participle for past possibility. Place not after the modal for negation (may not be). Maybe remains an adverb you can move to qualify the full clause.

Present/future: She may be late.
Past possibility: She may have been late.
Negation: The data may not be ready.
Adverb placement: Maybe we'll see. / We might maybe see. (placement affects emphasis)

FAQ

Is it 'maybe' or 'may be' after a noun?

After a noun you usually need a verb phrase, so use may be: "John may be the winner." If you're suggesting an action that follows, maybe can be acceptable depending on context.

Which is correct: 'She maybe late' or 'She may be late'?

"She may be late" is correct. "She maybe late" is wrong because maybe needs to modify a clause or verb, e.g., "Maybe she's late."

Can I use 'maybe' and 'may be' in the same sentence?

Yes. Use may be to state a possibility and maybe to make a suggestion: "The build may be unstable; maybe we should roll back."

How do I handle past possibilities?

Use may have + past participle: "The file may have been deleted."

What's the fastest way to fix a sentence I wrote?

Run the two substitution tests: replace with perhaps and with "it is possible that." Whichever matches your intended meaning is the correct form. When unclear, rewrite to remove ambiguity (e.g., "Perhaps..." or "It is possible that...").

Still unsure about a sentence?

Use the substitution tests or paste your sentence into the checker above. If needed, copy one of the rewrite patterns on this page: modal + be for possibility, maybe for suggestions.