私が着いたころには、彼はすでに出発してしまっていた。

By the time I arrived, he had already left.

私(わたし)が着(つ)いたころには、彼(かれ)はすでに出発(しゅっぱつ)してしまっていた。

Watashi ga tsuita koroni wa, kare wa sudeni shuppatsushiteshimatteita.

私 (わたし、わたくし)

I; me; private affairs; personal matter; secrecy; selfishness

が (が)

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

着く (つく)

to arrive at; to reach; to sit on; to sit at (e.g. the table)

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

彼 (かれ)

he; him; his; boyfriend

既に (すでに、すんでに)

already; too late

出発 (しゅっぱつ)

departure

Readings: シ、わたくし、わたし

Meanings: private, I, me

Readings: チャク、ジャク、き.る、 -ぎ、き.せる、 -き.せ、つ.く、つ.ける

Meanings: don, arrive, wear, counter for suits of clothing

Readings: ヒ、かれ、かの、か.の

Meanings: he, that, the

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

Readings: ハツ、ホツ、た.つ、あば.く、おこ.る、つか.わす、はな.つ

Meanings: departure, discharge, publish, emit, start from, disclose, counter for gunshots