so thatの繰り返し

Which is better concerning the use of "so that"? 1. The control unit controls the vehicle so that the vehicle moves at a certain speed and the brake of the vehicle is applied at an appropriate timing. 2. The control unit controls the vehicle so that the vehicle moves at a certain speed, and the brake of the vehicle is applied at an appropriate timing. 3. The control unit controls the vehicle so that the vehicle moves at a certain speed, and so that the brake of the vehicle is applied at an appropriate timing. 4. The control unit controls the vehicle so that the vehicle moves at a certain speed and so that the brake of the vehicle is applied at an appropriate timing. 5. The control unit controls the vehicle so that the vehicle moves at a certain speed, and that the brake of the vehicle is applied at an appropriate timing. 6. The control unit controls the vehicle so that the vehicle moves at a certain speed and that the brake of the vehicle is applied at an appropriate timing.

ChatGPT:

Here’s an analysis of each option regarding clarity, correctness, and fluency:

Key Considerations When Using "so that"

• "So that" introduces a purpose or result.
• If multiple clauses share the same purpose, one "so that" is usually enough.
• If multiple independent purposes/results exist, repeating "so that" is acceptable but can feel wordy.
• Using "and that" after "so that" is incorrect because "so that" already serves as a subordinating conjunction.

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Analysis of Each Option

1. "The control unit controls the vehicle so that the vehicle moves at a certain speed and the brake of the vehicle is applied at an appropriate timing."

   • ❌ Incorrect → The second clause lacks an explicit "so that", making the structure unclear.
   • Better: "so that the vehicle moves at a certain speed and so that the brake is applied..."

2. "The control unit controls the vehicle so that the vehicle moves at a certain speed, and the brake of the vehicle is applied at an appropriate timing."

   • ✅ Acceptable → The comma before "and" separates the ideas, treating them as two results.
   • Slight issue: The second clause lacks an explicit connection to "so that," making the relationship weaker.

3. "The control unit controls the vehicle so that the vehicle moves at a certain speed, and so that the brake of the vehicle is applied at an appropriate timing."

   • ✅ Grammatically correct → The repeated "so that" makes each result explicit.
   • Slightly wordy → The repetition is not always necessary unless emphasizing separate purposes.

4. "The control unit controls the vehicle so that the vehicle moves at a certain speed and so that the brake of the vehicle is applied at an appropriate timing."

   • ✅ Best balance of clarity and conciseness
   • Correct structure → Both clauses clearly depend on "so that," avoiding ambiguity.

5. "The control unit controls the vehicle so that the vehicle moves at a certain speed, and that the brake of the vehicle is applied at an appropriate timing."

   • ❌ Incorrect → "So that" and "and that" do not work together in this way.
   • Fix: Remove "and that" or replace "so that" with "ensuring."

6. "The control unit controls the vehicle so that the vehicle moves at a certain speed and that the brake of the vehicle is applied at an appropriate timing."

   • ❌ Incorrect → "And that" cannot follow "so that."
   • Fix: Use "and so that" or just "so that" once for both clauses.

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Best Choice

✅ Option 4:
"The control unit controls the vehicle so that the vehicle moves at a certain speed and so that the brake of the vehicle is applied at an appropriate timing."

• Clearly links both results to the control unit’s action.
• Eliminates ambiguity while avoiding excessive wordiness.

Would you like an even more natural version for readability? 😊