彼は英語がペラペラだ。

彼は英語がぺらぺらだ。

He has a good command of English.

彼(かれ)は英語(えいご)がペラペラだ。

Kare wa eigo ga perapera da.

彼 (かれ)

he; him; his; boyfriend

は (は)

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

英語 (えいご)

English (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: ヒ、かれ、かの、か.の

Meanings: he, that, the

Readings: エイ、はなぶさ

Meanings: England, English, hero, outstanding, calyx

Readings: ゴ、かた.る、かた.らう

Meanings: word, speech, language