On hearing that Judge Shurtleff and his wife and little boy had returned, they both declared that they must, as soon as possible, go and pay a visit to the lady, who was a great friend of theirs, though Juanita said that she could not admire her taste in marrying the old judge. (In the Wilds of Florida by W.H.G. Kingston）
動画の後半部分でリスニング用音声が流れます。
英文を前から読んでいくために、語句のかたまりを作ります。こんな具合に課題文をスラッシュ（斜め線）で区切ります（スラッシュリーディング）。語句のかたまりを意識すると、リスニングで英語の意味をつかむのが楽になります。
On hearing that Judge Shurtleff and his wife and little boy had returned,／（主語が文頭にないときの主語の前）they both declared／（接続詞の前）that they must, as soon as possible, go and pay a visit to the lady,／（関係代名詞の前）who was a great friend of theirs,／（接続詞の前）though Juanita said that she could not admire her taste in marrying the old judge.
語句のかたまりを前から訳していきます。
On hearing that Judge Shurtleff and his wife and little boy had returned,
シャートレフ判事と妻、小さな男の子が帰ってきたと聞くとすぐ
they both declared
２人は言った
that they must, as soon as possible, go and pay a visit to the lady,
できるだけ早く、夫人に会いに行かなければならないと
who was a great friend of theirs,
夫人は２人の親友だった
though Juanita said that she could not admire her taste in marrying the old judge.
もっともフアニータは、年老いた判事を結婚相手にした夫人のセンスを称賛することはできないと語った
On hearing that Judge Shurtleff and his wife and little boy had returned, they both declared that they must, as soon as possible, go and pay a visit to the lady, who was a great friend of theirs, though Juanita said that she could not admire her taste in marrying the old judge.
go and pay a visit to the lady→ go and＋動詞の原形 = 〜しに行く
her taste in marrying the old judge→ taste in ●= ●のセンス、趣味
シャートレフ判事と妻、小さな男の子が帰ってきたと聞くとすぐ、２人はできるだけ早く、夫人に会いに行かなければならないと言った。夫人は２人の親友だったが、年老いた判事を結婚相手にした夫人のセンスを称賛することはできないと、フアニータは語った。
on 〜ing = 〜するとすぐに
例：On hearing the news, she burst into tears.→ 彼女はその知らせを聞くとすぐに泣きだした。
on 〜ing は as soon as で書き換えることができます。上の文を書き換えると→ As soon as she heard the news, she burst into tears.
課題文中の表現：On hearing that Judge Shurtleff and his wife and little boy had returned→ シャートレフ判事と妻、小さな男の子が帰ってきたと聞くとすぐ
