You speak so softly in English, but usually you're so loud!
You are always lively and loud, but when you speak in English you get quiet.
You speak so softly in English,「英語で話すときは声が小さい」 but usually you're so loud!「でも、普通は声が大きいよ」
You are always lively and loud,「君はいつも活発的で声が大きい」 but when you speak in English you get quiet.「でも英語で話すと静かになるよ」
He usually speaks much louder, but for some reason his voice gets quiet when he speaks English.
He doesn't seem to talk as loud as usually does when he speaks English.
この場合、次のような言い方ができますよ。
ーHe usually speaks much louder, but for some reason his voice gets quiet when he speaks English.
「彼はいつももっと大きな声で話しますが、なぜか英語を話す時の声は小さいんです」
ーHe doesn't seem to talk as loud as usually does when he speaks English.
「彼は英語を話す時、いつもほど大きな声で話さないようです」
ご参考まで！
オーストラリア 
カナダ 
