彼女が電話してきたときに、私はたまたま居合わせた。

It happened that I was present when she called.

彼女(かのじょ)が電話(でんわ)してきたときに、私(わたし)はたまたま居合(いあ)わせた。

Kanojo ga denwashitekita tokini, watashi wa tamatama iawaseta.

彼女 (かのじょ)

she; her; her; girlfriend; sweetheart

が (が)

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

電話 (でんわ)

telephone call; phone call; telephone (device); phone

時に (ときに)

by the way; incidentally; sometimes; occasionally

私 (わたし、わたくし)

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

は (は)

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

偶々 (たまたま)

casually; unexpectedly; accidentally; by chance

居合わせる (いあわせる)

to happen to be present

Readings: ヒ、かれ、かの、か.の

Meanings: he, that, the

Readings: ジョ、ニョ、ニョウ、おんな、め

Meanings: woman, female

Reading: デン

Meaning: electricity

Readings: ワ、はな.す、はなし

Meanings: tale, talk

Readings: シ、わたくし、わたし

Meanings: private, I, me

Readings: キョ、コ、い.る、 -い、お.る

Meanings: reside, to be, exist, live with

Readings: ゴウ、ガッ、カッ、あ.う、 -あ.う、あ.い、あい-、 -あ.い、 -あい、あ.わす、あ.わせる、 -あ.わせる

Meanings: fit, suit, join, 0.1