“〜sazo〜darou・sazokashi”: Surely 〜, I Imagine (empathetic conjecture) [JLPT N1]

Content by NTJ Kuma · Nihongo to Japan editorial team · Updated July 27, 2026

「さぞお疲れでしょう」 — imagining your way into how someone else must feel (an empathetic guess).

「さぞお疲れでしょう」 — you must surely be tired (said with care)

To empathize with another's toil or feelings, a warm surmise — 「遠くからお越しいただき、さぞお疲れでしょう (having come from afar, you must surely be tired).」 「〜さぞ〜だろう／さぞかし」 = surely ～, must surely be ～. It's a strong surmise about another's situation or feelings, carrying empathy and care. This guide clarifies its core of “about another ＋ empathetic surmise,” its pairing with sentence-final 「〜だろう／でしょう,」 and separating it from the general 「きっと」 and the assertive 「に違いない.」

Core: surely ～ (an empathetic surmise about another's situation)

「さぞ（さぞかし）〜だろう／でしょう」 means “surely ～, (the other) must surely be very ～” — a strong surmise about another's situation, feelings, carrying care, sympathy, empathy:

• 一人で子供を育てて、さぞ大変だったでしょう (raising a child alone, it must surely have been very hard).
• 合格の知らせに、ご家族もさぞお喜びだろう (at the news of passing, your family must surely be delighted too).
• 大切な人を亡くして、さぞかしおつらいことでしょう (having lost a dear one, it must surely be very painful).

Feel: the core is “(the other) must surely be very ～” — an empathetic, caring strong surmise about another's toil, grief, joy and situation. It's mostly for surmising, sensing the other's feelings (hardship, sadness, joy), common in condolences, greetings, letters. 「さぞかし」 is an intensified version of 「さぞ.」 In English: surely ～, you must surely be ～.

Attachment & forms

Examples in use

• 徹夜で看病されて、さぞお疲れのことでしょう。(Nursing all night, you must surely be tired.)
• 長年の夢が叶って、さぞかしうれしかっただろう。(A long-held dream come true — you must surely have been overjoyed.)
• あんなことを言われて、さぞ悔しかったでしょうね。(Told such a thing, you must surely have felt bitter.)
• 初めての一人暮らし、さぞ心細いだろう。(A first time living alone — you must surely feel uneasy.)
• ご栄転とのこと、さぞお喜びのことと存じます。(On your promotion, you must surely be delighted.)

⚠️ Common mistakes to avoid

① The core is ‘an empathetic surmise about another's situation, feelings,' rarely about oneself. This is 「さぞ」's key feel. It's specifically for surmising, sensing ‘another's' situation, feelings, with empathy, care, sympathy — imagining the other must be hard-pressed／sad／glad, and expressing consideration: 一人で頑張って、さぞ大変でしょう (working alone, it must surely be hard — caring for the other). It's rarely for surmising one's own situation (one doesn't say 「私はさぞ疲れているだろう」). Test: to caringly surmise, sense the other “surely (you／he) must be very ～” → さぞ〜だろう; for surmising oneself → don't use さぞ.

② The sentence end must pair with 「〜だろう／でしょう／ことだろう」 (さぞ〜だろう as a pair). In attachment, 「さぞ」 is a surmise-correlating adverb; the sentence end must carry the surmise 「〜だろう／でしょう／ことだろう／ことでしょう」: さぞ〜だろう (surely ～), さぞ〜でしょう (surely ～, polite), さぞ〜ことでしょう (surely ～, more solemn). You can't have just 「さぞ」 with an assertive ending (×さぞ疲れた／○さぞ疲れただろう). Test: when using 「さぞ,」 the sentence end must pair with 「だろう／でしょう／ことだろう.」 「さぞかし」 likewise needs a surmise.

③ Separate it from 「きっと」 — さぞ carries empathy, is more solemn／written, きっと is general, neutral. Both express the surmise “surely,” but differ in feel. 「さぞ〜だろう」 = surely ～ (an empathetic surmise about another's feelings, more solemn, written, for condolence, sensing emotion): さぞお疲れでしょう (you must surely be tired — caringly surmising the other's toil). It's specifically for empathetically surmising another's feelings, situation, solemn and warm in tone, common in condolences, greetings. 「きっと」 = surely, certainly (a general surmise, neutral, spoken and written): 明日はきっと晴れるだろう (it'll surely be clear tomorrow — a general surmise about things), 彼はきっと来る (he'll surely come). It's the most general, neutral “surely,” for surmising anything (weather, outcome, another's behavior), without special empathy. Difference: 「さぞ」 specifically surmises another's feelings／situation, with empathy, more solemn (さぞお疲れでしょう); 「きっと」 general, neutral, for surmising anything (see 〈だろう〉). Test: to empathetically sense the other's feelings “surely you must be very ～” → さぞ; to generally surmise anything “surely ～” → きっと.

④ Separate it from 「に違いない」 — さぞ is an empathetic surmise (～ probably), に違いない is an assertive conclusion (must be). Both express “surely,” but differ in certainty, feel. 「さぞ〜だろう」 = surely ～ (an empathetic ‘surmise,' ending in the conjecture 「だろう」): さぞ悲しいだろう (you must surely be sad — a caring surmise, the tone still the conjectural “probably”). Though saying “surely,” it's still a caring surmise tone (～ probably). 「〜に違いない」 = must be ～, certainly ～ (an assertive ‘conclusion,' the speaker quite sure): 犯人は彼に違いない (the culprit must be him — a confident conclusion). It's a more affirmative, assertive judgment, high in certainty. Difference: 「さぞ〜だろう」 = an empathetic surmise (surely ～ probably, sensing another's feelings); 「に違いない」 = an assertive conclusion (must be ～, the speaker quite sure). Test: to empathetically surmise the other's feelings “surely you must be very ～” → さぞ〜だろう; to confidently conclude “must be ～” → に違いない.

🔄 Compare: さぞ〜だろう／きっと／に違いない／だろう

💡 Learning tip

「〜さぞ〜だろう／さぞかし」 = surely ～, must surely be ～ — three points: ① the core is “an empathetic surmise about another's situation, feelings” — imagining the other must be hard-pressed／sad／glad, with care (rarely about oneself); ② the sentence end must pair with 「〜だろう／でしょう／ことだろう」 (さぞ〜だろう as a pair); ③ separate it from 「きっと (general, neutral)」「に違いない (assertive conclusion)」 — さぞ carries empathy, is more solemn. This is a warm, caring expression — in condolence, 「さぞお疲れでしょう」「さぞおつらいことでしょう」 convey that care and empathy “I can imagine you must be very ～” with warmth and grace. To sense the other's toil, feelings with empathy, 「さぞ〜でしょう」 is most thoughtful; for a general surmise just use 「きっと〜だろう.」

❓ Common questions

Q: What's the difference between 「さぞ」 and 「きっと」? Both ‘surely, certainly'?

The difference is ‘object, empathy, register.' 「さぞ〜だろう」 = surely ～ (specifically an empathetic surmise about ‘another's feelings, situation,' more solemn, written): it's specifically for caringly surmising, sensing ‘another's' feelings, situation — imagining the other must be hard-pressed／sad／glad, with clear empathy, care, sympathy, mostly for condolence, greetings, letters: 一人で介護をされて、さぞご苦労が多いでしょう (caring for someone alone, you must surely have much hardship — caringly surmising the other's toil), さぞお喜びのことでしょう (you must surely be delighted). Its object is almost always “the other (another person),” and it's warm, solemn. 「きっと」 = surely, certainly (the most general, neutral surmise, spoken and written): the most general, neutral “surely,” for surmising anything (weather, outcome, another's behavior, one's own affairs), without special empathy: 明日はきっと晴れる (it'll surely be clear tomorrow), 彼はきっと成功する (he'll surely succeed), 私もきっと行く (I'll surely go too). Difference: 「さぞ」 specifically surmises ‘another's feelings, situation,' with empathy, more solemn (for condolence); 「きっと」 general, neutral, for surmising anything (including oneself, things). Test: to empathetically sense the other's feelings “surely you must be very ～” → さぞ (〜でしょう); to generally, broadly surmise anything “surely ～” → きっと. So use 「さぞお疲れでしょう」 to console another's toil (caring), and 「きっと晴れる」 to surmise tomorrow's weather (general).

Q: Must 「さぞ」 always be paired with 「だろう／でしょう」?

Yes — 「さぞ」 is a surmise-correlating adverb; the sentence end must pair with a surmise expression like 「〜だろう／でしょう／ことだろう／ことでしょう.」 「さぞ」 itself means “surely, certainly,” but it's an adverb requiring a sentence-final surmise to correlate — just like 「たぶん〜だろう」「きっと〜だろう,」 「さぞ」 too must pair with a final surmise 「だろう／でしょう,」 forming the correlation “さぞ〜だろう／でしょう”: さぞ驚いただろう (you must surely have been surprised), さぞおいしかったでしょう (it must surely have been delicious), さぞご心配なことでしょう (you must surely be worried). ⚠️You can't use just 「さぞ」 with an assertive ending: ×「さぞ疲れた」 (incomplete) → ○「さぞ疲れただろう」 (you must surely be tired). The final surmise forms are several: 〜だろう (plain), 〜でしょう (polite), 〜ことだろう／ことでしょう (more solemn, written, common in condolence). 「さぞかし」 likewise needs a surmise (さぞかし〜だろう). Test: when using 「さぞ／さぞかし,」 the sentence end must pair with 「だろう／でしょう／ことだろう,」 not end assertively. This is 「さぞ」's attachment rule.

🖊️ Practice Questions (5)

Q1. 「一人で育てて、___ご苦労されたでしょう。」(you must surely have)

(A) さぞ　(B) まさか　(C) もしや　(D) どうせ

Q2. What does 「さぞ」 commonly correspond with?

(A) 〜だろう／でしょう　(B) 〜ください　(C) 〜なさい　(D) 〜てはいけない

Q3. What does 「さぞお疲れでしょう」 mean?

(A) (considerately) You must surely be tired

(B) You're not tired

(C) Ordering the other person to rest

(D) I'm tired

Q4. In what situation is 「さぞ」 used?

(A) considering and empathizing with the other person's feelings/situation

(B) reproach

(C) command

(D) a plain statement of fact

Q5. Which usage is natural?

(A) さぞお喜びのことでしょう。　(B) さぞ行く。

(C) さぞを食べる。　(D) さぞだ高い。

Answer Explanations

1. (A) さぞ ── You must surely have had a hard time.

2. (A) 〜だろう／でしょう ── Must correspond with a conjecture.

3. (A) ── Considerately, you must surely be tired.

4. (A) ── Considering and empathizing with the other person.

5. (A) ── 「さぞお喜びのことでしょう」 is correct.