Breakdown of reenkondishon ga ii.

Questions & Answers about reenkondishon ga ii.
Because it is a loanword expression borrowed from English: lane condition.
In Japanese, katakana is commonly used for:
- foreign loanwords
- technical terms
- brand-like or industry-specific vocabulary
- words the writer wants to make stand out
This phrase is especially common in contexts like bowling, where many terms are borrowed from English.
が marks the subject of the sentence.
So in レーンコンディションがいい, レーンコンディション is the thing being described, and いい says something about it.
A natural way to think about it is:
- As for / the thing that is good = lane condition
More simply:
- The lane condition is good.
Here, が identifies what has the quality いい.