当某事发生时，某人记得他们正在做什么。

Sb remember what they were doing when STH happened.

youdao

当我经过他的房门时，我听到他正在做某事。

When I passed by his door, I heard him doing STH.

youdao

当我经过他的房门时，我听到他正在做某事。

When I passed by his door, I heard him doing STH.

youdao