1. a penny for your thoughts
(catchphrase) used to ask sb what he is thinking about.
（警語）用以問某人在想什麼。
據說當時有這種說法的時候，1便士在英國可是很值錢的哦。所以想知道別人在想什麼，就得付出點代價。
請看例句：
A: A penny for your thoughts.
A：想什麼呢？
B: Oh, I was just thinking about how to tell him I’m leaving.
B：哦，我在想怎麼跟他說我要走了。
2. burn the candle at both ends
exhaust oneself by trying to do too many things.
由於超負荷地工作而耗盡精力；操勞過度。
把蠟燭兩頭燒，沒多久就會燒完的。所以累了就該多多休息。
請看例句：
1. She’d been burning the candle at both ends studying for her exams and made herself ill.
她爲了準備考試一直太勞累了，結果病倒了。
2. Don’t burn the candle at both ends!
別太勞累了！ 來源:考試大-實用英語考試