私たちが帰宅したとたんに雨が降り出した。

Hardly had we come home when it began to rain.

私(わたし)たちが帰宅(きたく)したとたんに雨(あめ)が降(ふ)り出(だ)した。

Watashitachi ga kitakushita totanni ame ga furidashita.

私たち (わたしたち、わたくしたち)

we; us

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

帰宅 (きたく)

returning home

途端に (とたんに)

just as; in the act of; as soon as; at the moment that

雨 (あめ)

rain

降り出す (ふりだす)

to begin to rain; to begin to snow

Readings: シ、わたくし、わたし

Meanings: private, I, me

Readings: キ、かえ.る、かえ.す、おく.る、とつ.ぐ

Meanings: homecoming, arrive at, lead to, result in

Reading: タク

Meanings: home, house, residence, our house, my husband

Readings: ウ、あめ、あま-、 -さめ

Meaning: rain

Readings: コウ、ゴ、お.りる、お.ろす、ふ.る、ふ.り、くだ.る、くだ.す

Meanings: descend, precipitate, fall, surrender

Readings: シュツ、スイ、で.る、 -で、だ.す、 -だ.す、い.でる、い.だす

Meanings: exit, leave, go out, come out, put out, protrude