【JLPT N2】 ~につれて（ni tsurete） vs. ~に伴って（ni tomonatte）

This article analyzes the grammatical mechanisms and core differences between “~ni tsurete (〜につれて)” and “~ni tomonatte (〜に伴って).”

Core

~ni tsurete: Synchronized Pacing

~ni tomonatte: Simultaneous Event Arising

The Etymology and Meaning of “~ni tsurete”

• Etymology & Origins: Rooted in the verb “tsureru (連れる),” which physically means to walk together toward the same destination while holding hands. This physical dynamic of “walking hand-in-hand” has been grammaticalized into an expression that captures a beautifully synchronized progression of change.
• Linguistic Intuition for English Speakers:
  • “As [something] progresses…” (In parallel with a gradual, step-by-step forward movement.)
  • “Hand in hand with…” (Holding hands and matching pace perfectly.)

The Etymology and Meaning of “~ni tomonatte”

• Etymology & Origins: Rooted in the verb “tomonau (伴う),” which refers to a secondary element (a shadow or byproduct) automatically emerging alongside a primary person or event (the master). This framework has been grammaticalized into a powerful expression of logical and structural correlation.
• Linguistic Intuition for English Speakers:
  • “In tandem with…” (Completely paired together at the exact same moment, like an object and its shadow.)
  • “As a natural consequence of…” (Involuntarily arising as the structural or logical result of an event.)

The Definitive Differences

The ultimate dividing line rests on whether the co-occurring change demands a “smooth process (gradual synchronization of pace)” or a “structural co-occurrence (an event and its bundled result).”

The Structural Boundaries of “~ni tsurete” (Gradual Parallelism)

The preceding clause is strictly limited to verbs that express a steady, gradual shift in a single direction, such as taku naru (to get higher), susumu (to progress), or toshi o toru (to grow older). Because it requires a smooth timeline to simulate “walking hand-in-hand,” it cannot connect to abrupt, one-time historical events.

• ✕ 会社の倒産につれて、多くの社員が職を失った。 (Incorrect: A company bankruptcy is a sudden structural event, lacking a gradual timeline to walk hand-in-hand with.)
• ✕ 社長の交代につれて、会社の方針が変わった。 (Incorrect: A change in presidency is a single, discrete event).

The Structural Boundaries of “~ni tomonatte” (Structural Follow-Through)

The preceding clause can freely host major, one-off social disruptions or organizational overhauls (the event occurrence itself). Furthermore, it possesses an exceptionally high versatility because it can attach directly to nouns (e.g., 景気の回復に伴って / with the economic recovery). Because its cognitive system follows a master-and-shadow logic (“once the main event triggers, the shadow automatically follows”), it does not require a gradual, drawn-out process in the front clause.

• ◯ 社長の交代に伴って、新体制への移行が進められた。(With the change in presidency, the transition to a new structure was put into motion — Correct: The main event brings the shadow consequence along).
• ◯ 制度の変更に伴って、申請手続きが簡略化された。(Following the changes to the system, the application procedures were simplified).

Case Studies

駅前に巨大なショッピングモールが開業したことに伴って、周辺道路の渋滞が以前より著しく激しくなった。(Consequent upon the opening of a massive shopping mall in front of the station, traffic congestion on the surrounding roads has become noticeably more severe.)

子供が成長するにつれて、少しずつ親の手を離れ、自分だけの新しい世界を持つようになっていく。(As a child gradually grows up, they slowly drift away from their parents’ hands and come to possess a new world entirely their own.)

Summary

Feature Dimension	〜につれて (~ni tsurete)	〜に伴って (~ni tomonatte)
Cognitive Metaphor	Walking Hand-in-Hand (A smooth, gradual pace syncing up in one direction).	The Master and its Shadow (A major event arising alongside an unavoidable byproduct).
Nature of Front Clause	Verbs expressing slow, incremental, step-by-step changes.	Discrete one-off events, major organizational shifts, or standard nouns.
Discrete One-Off Events (e.g., Bankruptcy, Succession)	Strictly Forbidden (✕ 倒産につれて)	Fully Acceptable (◯ 交代に伴って: The byproduct follows the event).
Direct Noun Connection	Generally Forbidden (✕ 景気回復につれて)	Fully Acceptable (◯ 景気回復に伴って: Highly versatile across formal text).
Grammatical Register	Spans across everyday natural phenomena to standard business text.	Slightly rigid and formal; heavily preferred in official news and business settings.