〜ことだ

It is advisable to...; It is important to...

1. Overview

「〜ことだ」 is a grammatical structure used to express advice, suggestions, or important points regarding an action or situation. It often conveys a sense of recommendation or necessity.

2. Structure

• Verb (plain form) + ことだ
• Adjective (plain form) + ことだ
• Noun + ことだ

3. Usage Explanation

• Giving Advice:
  This structure is commonly used to provide advice or recommendations to someone about what they should do.

• Expressing Importance:
  It can also indicate that a particular action or consideration is important and should not be overlooked.

• English Translation:
  It can be translated as "It is advisable to...", "It is important to...", or "One should...".

4. Example Sentences

1. 健康のためには、毎日運動することだ。
   It is important to exercise every day for your health.

2. 試験に合格するためには、しっかり勉強することだ。
   To pass the exam, one should study thoroughly.

3. 旅行に行く前に、計画を立てることだ。
   It is advisable to make a plan before going on a trip.

4. 人とのコミュニケーションを大切にすることだ。
   It is important to value communication with others.

5. 問題が起きたら、すぐに相談することだ。
   If a problem arises, it is advisable to consult someone immediately.

5. Key Points to Note

• Advisory Tone:
  「〜ことだ」 often carries an advisory tone, indicating what the speaker believes is the best course of action.

• Formal Context:
  This structure can be used in both formal and informal contexts, making it versatile for various situations.

6. Similar Grammar

• 〜べきだ: Indicates what one should do or what is expected, emphasizing obligation.
  • Example: もっと勉強すべきだ。
    You should study more.

7. Alternative Grammar

• 〜必要がある: Expresses the necessity of doing something.
  • Example: 早く帰る必要がある。
    It is necessary to go home early.

8. Summary

「〜ことだ」 is used to provide advice or highlight the importance of an action or situation. It suggests what is considered wise or necessary to do, making it a valuable structure for offering guidance in conversations.