にして

にして is used to indicate a specific point, stage, or condition at which something happens or becomes clear.

It often emphasizes that the situation is special, unusual, late, or exceptional, and that the result occurs only at that point. Depending on context, it can mean:

• “at (a certain time/age)”

• “being (in a certain state)”

• “only when / not until”

This grammar is mainly used in formal or written Japanese, such as articles, reports, and literary expressions.

• ✔ Emphasizes a particular stage or condition

• ✔ Often paired with words like:

  • 初めて

  • ようやく

• ✔ Common in written / formal contexts

• ❌ Rare in casual conversation

• ❌ Not a simple replacement for に