確かに: 'Certainly' / 'It's True That...' (N3 Grammar)
Two jobs from one core idea
確かに is an adverb built from 確か ("certain, sure") plus に, and it does two related jobs:
- Affirming / agreeing — "certainly," "indeed," "for sure." You confirm that something is true.
- Conceding — in the pattern 確かに〜が／けど／けれど, you grant that one thing is true in order to counter it with something else.
Both grow from the same root act: you are acknowledging a fact. What separates them is whether a "but" is waiting behind it.
確かにそのとおりだ。
たしかに そのとおりだ。
That's certainly right.
Pure agreement — no 'but' coming.
ヤッタンの言うことは確かに正しい。
ヤッタンの いうことは たしかに ただしい。
What Yattan says is indeed correct.
確かにこのアプリは便利だが、高すぎる。
たしかに このアプリは べんりだが、たかすぎる。
It's true this app is convenient, but it's too expensive.
The concessive 確かに〜が pattern.
Loading the "yes, but" spring
Structurally 確かに is easy: as an adverb it just sits in front of the clause it modifies. The interesting part is the concessive move, where you pair it with a contrastive connector to set up a turn.
| Use | Pattern | Example |
|---|---|---|
| Affirm / agree | 確かに + [statement] | 確かにそうだ (that's certainly so) |
| Concede, then counter | 確かに + X + が／けど／けれど, + Y | 確かに便利だが、高い |
| Stronger contrast | 確かに + X。しかし／でも + Y | 確かに難しい。でも、やる価値はある |
In the concession pattern, 確かに flags the part you're giving ground on, and が／けど／しかし introduces your real point. Native speakers often "telegraph" a coming objection this way — when you hear 確かに, expect a but.
確かに値段は安いけど、品質がよくない。
たしかに ねだんは やすいけど、ひんしつが よくない。
It's true the price is cheap, but the quality isn't good.
モチは確かに頭がいいが、努力もしている。
モチは たしかに あたまが いいが、どりょくも している。
Mochi is certainly smart, but she works hard too.
確かに can concede a point in the other person's favor before adding to it.
先生「確かに難しい問題です。しかし、必ず解けます。」
せんせい「たしかに むずかしい もんだいです。しかし、かならず とけます。」
Teacher: 'It's certainly a hard problem. However, you can definitely solve it.'
The に that flips the meaning
Here is the trap that catches almost everyone. 確か on its own — usually set off at the start of a sentence — means "if I remember correctly / I think it was…" It expresses a hazy memory, not certainty. Despite sharing the kanji, it is almost the opposite feeling of 確かに.
確か、3時に会う約束だった。
たしか、さんじに あう やくそくだった。
If I remember correctly, we'd agreed to meet at three.
確か (no に) = uncertain recollection.
ヤッタンの誕生日は確か来月だったと思う。
ヤッタンの たんじょうびは たしか らいげつだったと おもう。
Yattan's birthday is next month, I think, if I recall.
Quick test: if you can replace it with "if I recall," it's 確か; if you mean "certainly / for sure," it's 確かに. The に matters.
Where it sits among its neighbours
- 確かに affirms something you both can recognize as true ("indeed, that's so"). It is softer and more conversational than a flat 本当に ("really").
- For expressing strong certainty about a conclusion (not agreement), N3 learners often reach for 〜に違いない ("must be, no doubt"). That's about your inference, whereas 確かに acknowledges a shared fact.
- The concessive 確かに〜が overlaps in spirit with contrast markers like ところが, but 確かに specifically front-loads a concession you're making before the turn.
Where learners slip
- Confusing 確かに with 確か. 確かに = certainly/indeed; 確か (no に) = "if I remember correctly." 確か、明日だった (I think it's tomorrow) ≠ 確かに明日だ (it's certainly tomorrow).
- Forgetting the "but" in concession. When you open with 確かに to concede, follow through with が／けど／しかし. Saying 確かに便利だ and stopping reads as plain agreement, not the concession you intended.
- Overusing it as "really." 確かに is agreement/acknowledgement, not intensity. "It's really delicious" is 本当においしい, not 確かにおいしい (which means "yes, it is indeed tasty — granting your point").
- Dropping に in writing. Because 確か and 確かに look alike, learners type 確か where 確かに is needed. Always include に when you mean "certainly."
The short version
- 確かに (adverb) = "certainly / indeed / it's true that…"
- Use 1: affirm / agree — 確かにそのとおりだ.
- Use 2: concede then counter — 確かに〜が／けど／しかし = "it's true that X, but…"
- 確か (no に) is different: "if I remember correctly," a hazy memory.
- When you open with 確かに to concede, deliver the "but."
Practice it
Choose 確かに or 確か, and complete the concession pattern correctly.
＿＿＿に入れるのに最もよいものを選びなさい。
＿＿＿その通りです。
Frequently asked questions
What's the difference between 確かに and 確か?
確かに (with に) is an adverb meaning 'certainly / indeed.' 確か (without に) means 'if I remember correctly' — a hazy recollection. Example: 確か3時だった ('I think it was 3') vs 確かに3時だ ('it's certainly 3').
How does the 確かに〜が pattern work?
It concedes a point before countering: 確かに便利だが、高すぎる ('it's true it's convenient, but it's too expensive'). 確かに flags what you're granting; が／けど／しかし introduces your real point.
Is 確かに the same as 本当に?
No. 確かに is agreement or acknowledgement ('indeed, that's true'), while 本当に means 'really / truly' as an intensifier. 本当においしい = 'really delicious'; 確かにおいしい = 'yes, it is tasty' (granting your point).
Can 確かに start a sentence on its own?
Yes — as a one-word agreement, 確かに。 means 'Indeed.' / 'You're right.' It's a natural, polite way to acknowledge what someone just said.
Where 確かに fits
Don't confuse it with
- 〜に違いない · N3 — 〜に違いない means 'must be' or 'I'm sure' — a strong, evidence-based conclusion. Learn the formation, the certainty ladder vs かもしれない・でしょう・はず, and common mistakes.
- ところが · N3 — 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.
More N3 grammar to explore
Keep going with related patterns at the same level:
- たとえば — たとえば (例えば) means 'for example.' Learn how it introduces a concrete example of a general statement, the たとえば〜など pattern, and why it's not the same as たとえ (even if).
- 〜てこそ — 〜てこそ marks an action as the indispensable basis for a good result: 努力してこそ成功する ('only by trying hard do you succeed'). Learn the formation, nuance, and pitfalls.
- 〜てみせる — 〜てみせる has two senses: demonstrating something by actually doing it, and a strong vow ('I'll do it, just watch'). Learn formation, both meanings, and てみる vs てみせる.
- 〜てしょうがない・〜てしかたがない — 〜てしょうがない and 〜てしかたがない attach to the て-form to say a feeling is unbearable: 会いたくてしょうがない, 暑くてしかたがない. Learn the form, register, and nuance.
- 〜てたまらない — 〜てたまらない attaches to the て-form of an adjective or verb to mean unbearably / so ... that I can't stand it — an overwhelming emotion or physical sensation.
- 〜てはいられない — 〜てはいられない attaches to the て-form to say you can't afford to stay in a state or keep doing something — there's no time or leisure for it. 泣いてはいられない = 'I can't afford to keep crying.'