If he was actually really angry he wouldn't be humming a song.
ご質問ありがとうございます。
・「If he was actually really angry he wouldn't be humming a song.」
(意味)彼が本当に怒ってるなら鼻歌なんて歌う心の余裕ないはず。
<例文> I don't think he's angry. If he was actually really angry he wouldn't be humming a song.
<訳> 彼は怒ってないと思う。彼が本当に怒ってるなら鼻歌なんて歌う心の余裕ないはず。
参考になれば幸いです。