もしかしたら: 'Maybe' / 'Perhaps' (Possibility)
The signal it sends at the head of a sentence
もしかしたら is an adverb you drop at the front of a sentence to warn the listener: what I'm about to say is only a possibility, not a fact. It corresponds to English "maybe," "perhaps," or "possibly." Crucially, it stakes out a lowish probability — you're floating an idea, not backing a likely outcome, which is what separates it from たぶん and おそらく further down.
もしかしたら、先生はもう帰ったかもしれません。
もしかしたら、せんせいは もう かえった かもしれません。
Maybe the teacher has already gone home.
もしかすると、明日の試験は中止になるかもしれない。
もしかすると、あしたの しけんは ちゅうしに なる かもしれない。
Possibly tomorrow's exam will be cancelled.
Why it can't stand alone — the かもしれない bracket
Because もしかしたら only flags possibility, it leans on a matching ending — usually 〜かもしれない ("might / may"). Think of もしかしたら as the opening bracket and かもしれない as the closing bracket: together they wrap the whole guess. The adverb itself never changes shape; you place it at the head and let the verb or adjective carry the ending.
| Pattern | Structure | Example |
|---|---|---|
| Standard | もしかしたら / もしかすると + [clause] + かもしれない | もしかしたら、雨が降るかもしれない |
| With explanatory の | …もしかしたら + [clause] + のかもしれない | もしかしたら、寝坊したのかもしれない |
| Checking (もしかして) | もしかして + [clause] + ですか / ？ | もしかして、田中さんですか？ |
| Casual ending | もしかしたら + [clause] + かも | もしかしたら、行けないかも |
もしかしたら、モチは道に迷っているのかもしれない。
もしかしたら、モチは みちに まよっているのかもしれない。
Maybe Mochi is lost.
The の before かもしれない adds an explanatory feel.
もしかすると、この問題は私たちが思っているより難しいかもしれない。
もしかすると、この もんだいは わたしたちが おもっているより むずかしい かもしれない。
Perhaps this problem is harder than we think.
ヤッタンは、もしかしたら試験に落ちるかもしれないと心配している。
ヤッタンは、もしかしたら しけんに おちる かもしれないと しんぱいしている。
Yattan is worried that he might possibly fail the exam.
Embedded inside と思う / と心配する is fine.
Three openers, three shades
もしかしたら / もしかすると / もしかして are near-synonyms, but the register drifts across them: もしかすると sounds a touch more formal or written, もしかしたら is the everyday default, and もしかして carries an extra "checking a hunch" flavor. Swap them freely in ordinary guesses; reach for もしかして specifically when you're probing a suspicion rather than estimating odds.
もしかして and the art of the hunch
もしかして is the odd one out: besides "maybe," it's the go-to way to tentatively confirm something you suspect. Here it often ends in a plain question, not かもしれない — the "by any chance…?" framing is softer and more polite than asking outright.
もしかして、田中さんですか。
もしかして、たなかさんですか。
Are you Tanaka, by any chance?
もしかして、弟がぼくのケーキを食べた？
もしかして、おとうとが ぼくの ケーキを たべた？
Did my little brother possibly eat my cake?
Voicing a suspicion you half-expect to be true.
Because it's a gentle probe, answer it in kind: a soft はい、そうです or いいえ、違います fits better than a blunt reply.
Where learners slip
- Leaving the かもしれない ending off. もしかしたら sets up a guess, so a flat assertion feels unfinished. Say もしかしたら、休みかもしれない (✓), not just もしかしたら、休みだ (✗ — sounds contradictory: "maybe… it definitely is").
- Mistaking it for the conditional もし. Bare もし means "if" and pairs with 〜たら/〜なら (もし雨なら…). もしかしたら is a finished adverb meaning "maybe" — don't expect an "if" clause after it.
- Reaching for it when you're fairly sure. もしかしたら implies a lowish probability. If you're fairly confident, use たぶん ("probably") or おそらく ("likely") instead — もしかしたら downgrades your certainty.
The short version
- もしかしたら / もしかすると / もしかして = "maybe, perhaps, possibly," placed at the start of the sentence.
- It almost always pairs with 〜かもしれない (or casual かも) at the end.
- もしかして can also check a hunch: もしかして、田中さんですか？ ("Are you Tanaka, by any chance?").
- It signals lowish probability — weaker than たぶん / おそらく.
- Don't confuse it with the conditional もし ("if").
Practice it
Choose the natural use of もしかしたら / もしかして and its ending.
＿＿＿に入れるのに最もよいものを選びなさい。
＿＿＿、明日雨かもしれない。
Frequently asked questions
What's the difference between もしかしたら, もしかすると, and もしかして?
They all mean 'maybe / perhaps.' もしかしたら is the everyday default, もしかすると feels slightly more formal or written, and もしかして adds a 'checking a hunch' flavor — it's the natural way to ask 'are you... by any chance?'
Does もしかしたら always need かもしれない?
Almost always, yes. It flags a possibility, so it naturally closes with 〜かもしれない (or casual かも). The main exception is もしかして used to confirm a suspicion, which can end in a plain question: もしかして、田中さんですか？
How is もしかしたら different from たぶん?
Both soften a statement, but もしかしたら implies a lower probability ('maybe, possibly'), while たぶん means 'probably' — you're fairly confident. おそらく is similar to たぶん and a bit more formal.
Is もしかしたら the same as もし?
No. もし alone means 'if' and introduces a conditional (もし雨なら…). もしかしたら is a complete adverb meaning 'maybe' and pairs with かもしれない, not with an 'if' clause.
Where もしかしたら fits
Shaky on this? Get these solid first
- Conditional 〜たら · N4 — 〜たら is Japanese's most flexible conditional: just add ら to the plain past. Learn the formation, the 'if/when' meaning, the discovery use, and how it beats ば/と for requests.
- 〜かもしれない · N4 — かもしれない means 'might' or 'maybe' — it shows you're unsure. Learn how it attaches to plain verbs, adjectives, and nouns, plus the casual かも and how it ranks against でしょう and はず.
- Past Tense · N5 — The plain past た-form means 'did.' It follows the same sound changes as the て-form (just て→た, で→だ): 食べた, 行った, 飲んだ. Learn it by verb group.
Don't confuse it with
- 〜かもしれない · N4 — かもしれない means 'might' or 'maybe' — it shows you're unsure. Learn how it attaches to plain verbs, adjectives, and nouns, plus the casual かも and how it ranks against でしょう and はず.
More N3 grammar to explore
Keep going with related patterns at the same level:
- 〜ながら — Concessive 〜ながら(も) means 'although / even though / despite' — it links two clashing facts. Learn how it differs from the N5 'while doing' ながら, the attachment rules, and common pitfalls.
- 〜にしても — 〜にしても means 'even if' or 'even granting that' — a concession over a supposed case. Learn the formation, それにしても ('even so'), the 〜にしても〜にしても pairing, and how it differs from としても.
- ところが — ところが is a conjunction meaning 'however / but' that introduces a surprising, often unfortunate result contrary to what you expected. Learn the nuance and how it differs from でも and けど.
- 〜どころか — 〜どころか flips an expectation on its head: 'far from X, the opposite happened' or 'let alone X.' Learn both senses, how it attaches, and the common direction-of-contrast mistake.
- 〜きり — 〜きり has two jobs: with a noun it means 'only/just' (一度きり = only once), and after a た-verb it means 'since X (and the expected next thing never happened).'
- 〜こそ — こそ emphasizes the word before it: 'precisely, exactly, the very one.' Learn 今度こそ, こちらこそ, and からこそ ('precisely because'), with examples and common mistakes.