ことのないよう（に）
So that (something bad) does not happen / in order to prevent → expresses preventive intention to avoid an undesirable result
N1
Meaning
So that (something bad) does not happen / in order to prevent → expresses preventive intention to avoid an undesirable result
Formation
Verb (dictionary form) + ことのないよう（に） + Action
Verb (ない-form) + ことのないよう（に） + Action
Explanation
ことのないよう（に） is used when the speaker takes measures or gives instructions to ensure that an undesirable event does not occur.
🔸 ことのないよう = prevention
Key idea:
“Take action A so that bad thing B will not happen.”
Important nuances:
The avoided event is usually negative or risky
The expression focuses on prevention, not reaction
The tone is formal, careful, and responsible
Common in instructions, warnings, notices, and JLPT N1 passages
This grammar often appears in:
safety instructions
official notices
guidance manuals
workplace or public announcements