試着室は今使用中だ。

試着室は今使用中だ。

The fitting room is being used now.

試着室(しつ)は今(こん)使用中(しようちゅう)だ。

Shitsu wa kon shiyōchū da.

は (は)

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

今 (こん)

the current ...; this; today's ...

使用中 (しようちゅう)

busy; in the middle (of)

だ (だ)

be; is; indicates past or completed action; indicates light imperative

Readings: シ、こころ.みる、ため.す

Meanings: test, try, attempt, experiment, ordeal

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: シツ、むろ

Meanings: room, apartment, chamber, greenhouse, cellar

Readings: コン、キン、いま

Meaning: now

Readings: シ、つか.う、つか.い、 -つか.い、 -づか.い

Meanings: use, send on a mission, order, messenger, envoy, ambassador, cause

Readings: ヨウ、もち.いる

Meanings: utilize, business, service, use, employ

Readings: チュウ、なか、うち、あた.る

Meanings: in, inside, middle, mean, center