〜にわたって・わたり・わたる・わたった

Across ~; Involving ~

1. Overview

The structure「〜にわたって」 indicates a range or duration, referring to something that extends or spans a specific scope, time, or location. This grammar is used to describe a wide impact or coverage from one point to another.

2. Structure

• Noun + にわたって
• Noun + わたり
• Verb (dictionary form) + わたる
• Verb (た-form) + わたった

3. Usage Explanation

• Indicating Range: This structure expresses that an event, action, or state occurs or affects a particular range.

• Indicating Time: It can also describe an activity, process, or state that lasts for a certain duration.

4. Example Sentences

1. 全国にわたって、多くの人々が参加しました。
   (Many people participated across the entire country.)

2. この問題は数年にわたって続いています。
   (This issue has continued for several years.)

3. 会議は数時間にわたり行われました。
   (The meeting was held for several hours.)

4. 彼は日本全国をわたり、さまざまな文化を学びました。
   (He traveled across Japan and learned about various cultures.)

5. 研究は数ヶ月にわたって実施されました。
   (The research was conducted over several months.)

5. Key Points to Note

• Scope and Duration: 「〜にわたって」and「〜わたり」 emphasize range, while「〜わたる」 and「〜わたった」 can focus more on the continuity of an action or state.

• Usage Context: This structure is suitable for describing broad influences, ongoing processes, or large-scale activities and is commonly found in formal contexts and written language.

6. Similar Grammar

• 〜を通じて: Indicates a means or method through which something is done.
  • Example: 彼は国際的な交流を通じて、友人を増やした。
    (He made friends through international exchanges.)

7. Alternative Grammar

• 〜において: Indicates a specific occasion or range.
  • Example: 国際会議において、この問題が取り上げられた。
    (This issue was addressed at the international conference.)

8. Summary

「〜にわたって」and its related forms are used to express a sustained state that spans across ranges, times, or locations, highlighting the extensive influence and continuity of something. It is commonly used in both formal writing and conversation.