調査 and 調べる: Bridge Safety, Historical Maps, and Train Times
Compare a bridge-safety investigation and survey results with maps collected to investigate history and train times checked before departure. Follow the activity name, verb, object, and action stage without imposing exclusive users.
調査: An investigation in progress and survey results
調査 (ちょうさ) means investigation or survey. 「技師が橋の安全性を調査している。」 — “An engineer is investigating the safety of the bridge.” The engineer is investigating the bridge's safety. 調査している gives an activity in progress, without a finding that the bridge has been judged safe.
「アンケート調査の結果を表にまとめた。」 — “I organized the survey results in a table.” Survey results were organized in a table. Organizing them does not establish that every response was verified or that the table's statistical accuracy was confirmed.
調べる: A purpose for collecting maps and a schedule checked
調べる (しらべる) means investigate or check. 「町の歴史を調べるため、古い地図を集めました。」 — “We collected old maps to investigate the city's history.” Old maps were collected for investigating the city's history. The collection is the reported action and the historical investigation is its purpose, without a completed historical conclusion.
「出発前に電車の時刻を調べました。」 — “I checked the train schedule before departure.” The train schedule was checked before departure. Here the verb concerns checking train times, without an additional report of boarding the train or completing a journey.
Follow the activity name and the verb's object
調査 names an investigation and combines with している to present the activity in progress. 調べる is a verb connecting the action with the history investigated or the train times checked. Read the different constructions through their objects and stages.
An engineer in the bridge example does not restrict 調査 to professionals, and checking train times does not restrict 調べる to simple searches. The bridge investigation, survey table, map collection, and schedule check are separate situations.
How do the bridge-safety 調査 and the example of 調べる for train times present the activity and its object?
Show the answer and why
調査している presents investigation of the bridge's safety in progress; 調べました reports checking train times before departure. Compare the activity-name and verb constructions and their objects, without turning the investigation into a completed safety judgment or restricting the verb to simple searches.