トムは日本語がぺらぺらだ。

とむは日本語がぺらぺらだ。

Tom is a fluent speaker of Japanese.

トムは日本語(にほんご)がぺらぺらだ。

Tomu wa nihongo ga perapera da.

富む (とむ)

to be rich; to become rich; to be abundant (with); to abound (with); to be rich (in)

は (は)

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

日本語 (にほんご、にっぽんご)

Japanese (language); Japanese as a second language

が (が)

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

ペラペラ (ペラペラ、ぺらぺら)

fluent; fluency; flipping (pages); thin or weak (paper, cloth)

だ (だ)

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

Readings: ニチ、ジツ、ひ、 -び、 -か

Meanings: day, sun, Japan, counter for days

Readings: ホン、もと

Meanings: book, present, main, origin, true, real, counter for long cylindrical things

Readings: ゴ、かた.る、かた.らう

Meanings: word, speech, language