“〜ni sotte・ni sotta”: Along / In Line With 〜 (following a policy/route) [JLPT N2]

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

「海岸線に沿ってドライブ」「方針に沿って行動」 — along a route, or in line with a policy.

「計画に沿って、進めましょう」 — go along the set course, don't derail

Launching a project, 「当初の計画に沿って、進めていきましょう」 (let's proceed in line with the original plan) — 「〜に沿って・〜に沿った」 = along ～, in line with ～, following ～, meaning “doing something along a set policy, plan, process, route (or expectation).” Its core is “following a set line/direction.” This guide covers its use, the attributive 「に沿った,」 and its division of labor with 「に基づいて (judging by a standard)」 (see 〈に基づいて〉).

Core: following a set policy/process/route

「noun ＋ に沿って」 means “proceeding along ～ (a set policy, plan, process, route)”:

• 方針に沿って、業務を進める (advance the work in line with the policy).
• マニュアルに沿って、操作する (operate following the manual).
• 川に沿って、道が続いている (the road continues along the river). — physical along

Feel: “along ～, in line with ～, following ～” — the core is “going along a set ‘line/direction/process,' without deviating.” What precedes is mostly a set direction/process — 方針・計画・マニュアル・流れ・線・ルート・期待・希望. It also has the physical “along” (川に沿って = along the river). To modify a noun, use 「に沿った ＋ noun」 (希望に沿った提案).

Attachment & forms

Examples in context

• 会社の方針に沿って、新しい制度を導入した。(In line with company policy, a new system was introduced.)
• マニュアルに沿って作業すれば、ミスは減る。(Working along the manual reduces mistakes.)
• お客様のご要望に沿ったプランをご用意しました。(We've prepared a plan in line with your request.)
• 議論は、あらかじめ決めた流れに沿って進んだ。(The discussion proceeded along a pre-decided flow.)
• ご期待に沿えるよう、全力を尽くします。(We'll do our utmost to live up to your expectations.)

⚠️ Common mistakes to avoid

① Precedes ‘方針・計画・流れ・期待' etc. — a set direction/process. The first clause of 「に沿って」 is mostly a set policy, plan, process, route, expectation — 方針・計画・方向性・マニュアル・手順・流れ・ルート・線・レール・期待・希望・意向. It means “going along this set line/direction/process, without deviating,” with the sense of “following, not derailing”: 計画に沿って進める (proceed along the plan), 流れに沿って進行する (proceed along the flow), ご希望に沿って (in line with your wish). So it stresses “going along a set direction/process,” with “a line/policy to follow” before it. Test: is the preceding “a set policy/plan/process/route/expectation” to go along? Yes → に沿って applies. It can also be the physical “along” (川に沿って歩く = walk along the river).

② 「に沿って」 vs 「に基づいて」: going along a set route vs grounding judgment in a standard. Both mean “following ～,” but with a different emphasis (see 〈に基づいて〉). 「〜に沿って」 = along ～, in line with ～ (going along a set policy/process/route): stresses “going along a set line/direction/process, without deviating”: 計画に沿って進める (proceed along the plan — go along the plan), マニュアルに沿って操作する (operate following the manual — along the manual's process). It's “going along a set direction/process” (advancing along a line). 「〜に基づいて」 = based on ～ (grounding ‘judgment/action' in a standard/basis): stresses “grounding in a standard, basis, to judge”: 法律に基づいて判断する (judge in accordance with the law — grounding in the law), データに基づいて分析する (analyze based on data — grounding in data). It's “grounding judgment in a standard/basis” (grounded). Difference: 「に沿って」 is “going along a set direction/process/route” (along a line, following a path); 「に基づいて」 is “grounding judgment in a standard/basis” (grounded). Test: to say “go along a set policy/plan/process” → に沿って (following a direction, not deviating); to say “judge based on a standard/basis” → に基づいて (grounded, see 〈に基づいて〉). E.g. 「計画に沿って進める (proceed along the plan — go along the plan's direction)」 uses に沿って; 「事実に基づいて判断する (judge based on facts — grounding in facts)」 uses に基づいて. One goes along a direction, one grounds judgment in a standard.

③ To modify a noun use 「に沿った」; idiom 「ご期待に沿う.」 Note the attachment. To modify a noun, use the attributive 「に沿った」 (not 「に沿って」): ○ 希望に沿ったプラン (a plan in line with the wish — modifies the noun 「プラン」), ○ 方針に沿った運営 (management in line with the policy) / × 希望に沿ってプラン (when modifying a noun, use に沿った). For a verb clause, use 「に沿って」: ○ 計画に沿って進める (proceed along the plan — modifies the verb 「進める」). Also, 「ご期待に沿う／ご希望に沿う」 is a common business idiom = “live up to expectations／meet a request”: ご期待に沿えるよう努力します (I'll strive to live up to your expectations), ご要望に沿う形で (in a form that meets your request). Here 「沿う」 means “meet, comply with (the other's expectation/need),” a gracious phrasing in hospitality and business. Test: modify a noun use に沿った, modify a verb use に沿って; memorize 「ご期待に沿う」 as an idiom (live up to expectations).

🔄 Compare: に沿って／に基づいて／に従って／通りに

💡 An exam judgment tip

「〜に沿って・に沿った」 = along ～, in line with ～ (going along a set policy/plan/process/route) — three points: ① precedes a set policy/plan/process/expectation — 計画に沿って (along the plan), マニュアルに沿って (following the manual), ご期待に沿う (live up to expectations, a business idiom); ② division of labor with 「に基づいて」 — に沿って is “going along a set direction/process” (following a path, not derailing), に基づいて is “grounding judgment in a standard/basis” (grounded, see 〈に基づいて〉); ③ to modify a noun use 「に沿った」 (希望に沿った提案). This pattern is very common in business, project management — 「計画に沿って」「方針に沿って」「ご希望に沿って」 — stressing “following a set direction, smooth progress, meeting expectations.” The physical “along” (川に沿って) is the same word.

❓ Common questions

Q: 「に沿って」 and 「に基づいて」 both mean ‘following ～' — how do I tell them apart?

The difference is “going along a set direction/process” vs “grounding judgment in a standard/basis” (see 〈に基づいて〉). 「〜に沿って」 = along ～, in line with ～ (going along a set policy/plan/process/route): stresses “advancing along this set line/direction/process, without deviating, without derailing,” preceding a set direction/process — 方針・計画・マニュアル・流れ・線・期待: 会社の方針に沿って業務を進める (advance the work in line with company policy — along the policy), マニュアルに沿って操作する (operate following the manual — along the manual's process), 当初の計画に沿って進める (proceed along the original plan). Its focus is “going along a set direction/process” (advancing along a line, like walking along a path). 「〜に基づいて」 = based on ～ (grounding in a standard/basis to judge/act): stresses “grounding in a standard, basis, principle, to judge or act,” preceding a basis — 法律・規則・データ・事実・証拠: 法律に基づいて処理する (handle in accordance with the law — grounding judgment in the law), 証拠に基づいて結論を出す (draw a conclusion based on evidence — grounding in evidence). Its focus is “grounding judgment in a standard/basis” (grounded, determined by it). Difference: 「に沿って」 is “going along a set direction/process” (along a line, following a route); 「に基づいて」 is “grounding judgment in a standard” (grounded, judging by it). One is “following along a path,” one is “grounded in a basis.” Test: to say “go along a set policy/plan/process” (following a direction, not deviating) → に沿って; to say “judge, act based on a standard/basis” (grounded) → に基づいて. E.g. 「計画に沿って進める (proceed along the plan — go along the plan's direction)」 uses に沿って; 「規則に基づいて処分する (discipline based on the rules — grounding judgment in the rules)」 uses に基づいて. Sometimes the two are close and interchangeable, but 「に沿って」 leans “going along a set direction/process,” 「に基づいて」 leans “grounding judgment in a standard.”

Q: What does 「ご期待に沿う」 mean? I often hear it in business.

「ご期待に沿う／ご希望に沿う／ご要望に沿う」 = “live up to (your) expectations／meet (your) wishes／comply with (your) request,” a very common, gracious idiom in business and hospitality. Literally “go along (the other's) expectation/need,” extended to “(striving to) meet, comply with the other's expectation/need, not disappointing them.” Common uses: ① expressing effort to meet expectations: ご期待に沿えるよう、全力を尽くします (we'll do our utmost to live up to your expectations), 皆様のご期待に沿うサービスを提供します (provide a service that lives up to everyone's expectations); ② politely expressing “we may not be able to meet it”: ご希望に沿えず、申し訳ございません (we're sorry we couldn't meet your wish — a polite decline/apology), ご要望に沿いかねます (we're afraid we can't comply with your request — a polite decline). Here 「沿う」 means “meet, comply with (the other's expectation/need),” a gracious, considerate phrasing that puts “satisfying the other” as “going along the other's expectation,” very polite. So in business email or hospitality, to express “we'll strive to meet your expectations/needs” use 「ご期待に沿えるよう,」 to politely say “we're afraid we can't” use 「ご希望に沿えず／沿いかねます」 — both gracious. It's a special, idiomatic use of 「に沿って (following),」 applying “following” to “complying with the other's expectation/need.” Remember 「ご期待に沿う = live up to expectations」 as a business idiom — very practical.

🖊️ Practice Questions (5)

Q1. 「スケジュール___、旅行の準備を進めてください。」(Please carry out the trip preparations in line with the schedule)

(A) に従って　(B) に沿って　(C) に基づいて　(D) によって

Q2. 「海岸線___、のんびりとドライブした。」(We drove leisurely along the coastline)

(A) に基づいて　(B) に従って　(C) に沿って　(D) に向かって

Q3. 「上司の指示___、資料をまとめた。」(I compiled the materials following my boss's instructions — emphasizing obedience)

(A) に沿って　(B) に基づいて　(C) に従って　(D) both A and C work

Q4. 「に沿って」が使えない文はどれ？

(A) 方針に沿って行動する。

(B) 規則に沿って従う。

(C) 川に沿って歩く。

(D) 計画に沿って進める。

Q5. 「国の法律___、この事業を進めなければならない。」(This project must be carried out based on the country's laws — emphasizing the basis)

(A) に沿って　(B) に基づいて　(C) に従って　(D) に向かって

Answer Explanations

1. (B) に沿って ── 「スケジュールに沿って」(in line with the schedule), 「進める」= proceeding according to a plan → に沿って.

2. (C) に沿って ── 「海岸線に沿って」(along the coastline), 「ドライブした」= physically following along → に沿って.

3. (C) に従って ── 「上司の指示に従って」(following the boss's instructions) = obeying / complying with an order → に従って is the most natural (emphasizing obedience to the boss).

4. (B) ── 「規則に沿って従う」(complying along the rules) = redundant (に沿って already means following), so it sounds awkward. The correct form would be 「規則に従う」(obey the rules) or 「規則に沿って行動する」.

5. (B) に基づいて ──「国の法律に基づいて、この事業を進める」(carrying out the project based on the country's laws) = emphasizing the law as the basis → に基づいて. (C) に従って leans toward "obey," (A) に沿って leans toward "along the policy," (D) に向かって means heading toward a direction.