ちょうど彼が話しているときに、火事が起こった。

Just as he was speaking, a fire broke out.

ちょうど彼(かれ)が話(はな)しているときに、火事(かじ)が起(お)こった。

Chōdo kare ga hanashiteiru tokini, kaji ga okotta.

丁度 (ちょうど)

just; right; exactly

彼 (かれ)

he; him; his; boyfriend

が (が)

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

話す (はなす)

to talk; to speak; to converse; to chat; to tell; to explain; to narrate; to mention; to describe; to discuss; to speak (a language)

時に (ときに)

by the way; incidentally; sometimes; occasionally

火事 (かじ)

fire; conflagration

起こる (おこる)

to occur; to happen

Readings: ヒ、かれ、かの、か.の

Meanings: he, that, the

Readings: ワ、はな.す、はなし

Meanings: tale, talk

Readings: カ、ひ、 -び、ほ-

Meaning: fire

Readings: ジ、ズ、こと、つか.う、つか.える

Meanings: matter, thing, fact, business, reason, possibly

Readings: キ、お.きる、お.こる、お.こす、おこ.す、た.つ

Meanings: rouse, wake up, get up