我们到的时候他们正在唱歌。

They were singing when we arrived.

youdao

我们到的时候他们正在唱歌。

They were singing while we arrived.

youdao

他们正在唱歌和跳舞。

They're singing and dancing.

youdao

他们进去的时候，玛吉正在唱歌，唱着那些狂野的歌曲和片断和一些陈旧的曲调。

Madge was singing when they entered singing her own wild snatches of songs and obsolete air.

youdao

他们进去的时候，玛吉正在唱歌，唱着那些狂野的歌曲和片断和一些陈旧的曲调。

Madge was singing when they entered singing her own wild snatches of songs and obsolete air.

youdao