He only learned a few vocabularies, but never practiced it.

英訳に間違いが有れば正してください。

彼は僅かな語彙を学んだが練習しなかった。
He only learned a few vocabularies, but never practiced it.

ヒント
名詞

答え
few vocabulariesをlittle vocabularyにする

He only learned a little vocabulary , but never practiced it.

vocabularyは不可算名詞