今日はジョンが当番です。

今日はジョンが当番です。

John is on duty today.

今日(きょう)はジョンが当番(とうばん)です。

Kyō wa Jon ga tōban desu.

今日 (きょう、こんにち、こんち、こんじつ)

today; this day; these days; recently; nowadays

は (は)

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

が (が)

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

当番 (とうばん)

being on duty

です (です)

be; is

Readings: コン、キン、いま

Meaning: now

Readings: ニチ、ジツ、ひ、 -び、 -か

Meanings: day, sun, Japan, counter for days

Readings: トウ、あ.たる、あ.たり、あ.てる、あ.て、まさ.に、まさ.にべし

Meanings: hit, right, appropriate, himself

Readings: バン、つが.い

Meanings: turn, number in a series