While with 〜うちは
うちは refers to a period of time in contrast to some other period of time. The contrasting period of time is represented by the modifier in front of うちは.
See also
- When refering to a period of time, especially when taking advantage of an opportunity, 〜うちに 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)
