During with 〜うちに
〜うちに is used to refer to a period of time. The period of time is represented by the modifier in front of うちに. Often 〜うちに is used when taking advantage of an opportunity.
See also
- When contrasting with another period of time, 〜うちは is used.
- When one action takes place during another, 〜間(に) is used.
- For concurrent events, 〜ながら is used.
Further reading
- How to use うちに & うちは (maggiesensei.com)