彼等は授業中だ。

彼等は授業中だ。

They are in class.

彼等(かれら)は授業中(じゅぎょうちゅう)だ。

Karera wa jugyōchū da.

彼ら (かれら)

they (usually male); them

は (は)

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

授業中 (じゅぎょうちゅう)

while in class

だ (だ)

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

Readings: ヒ、かれ、かの、か.の

Meanings: he, that, the

Readings: トウ、ひと.しい、など、 -ら

Meanings: etc., and so forth, class (first), quality, equal, similar

Readings: ジュ、さず.ける、さず.かる

Meanings: impart, instruct, grant, confer

Readings: ギョウ、ゴウ、わざ

Meanings: business, vocation, arts, performance

Readings: チュウ、なか、うち、あた.る

Meanings: in, inside, middle, mean, center