when: [OE] When was formed from the ancient interrogative base *qwo- (source also of English what, who, etc) and a nasal suffix which also appears in then. From the same ancestor, but with an additional dental suffix, came Latin quando ‘when’, source of English quandary. => quandary
when (adv.)
Old English hw?nne, hwenne, hwonne, from Proto-Germanic *hwan- (cognates: Old Saxon hwan, Old Frisian hwenne, Middle Dutch wan, Old High German hwanne, German wann "when," wenn "if, whenever"), from pronominal stem *hwa-, from PIE interrogative base *kwo- (see who). Equivalent to Latin quom, cum. As a conjunction in late Old English. Say when "tell me when to stop pouring you this drink" is from 1889.
雙語例句
1. The best thing to do when entering unknown territory is smile.
踏入未知地帶最好的對策就是微笑。
來自美劇《凱莉日記》
2. When life gets hard and you want to give up, remember that life is full of ups and downs, and without the downs, the ups would mean nothing.
當生活很艱難，你想要放棄的時候，請記住，生活充滿了起起落落，如果沒有低谷，那站在高處也失去了意義。
來自
3. Good luck is when an opportunity comes along and you're prepared for it.
好運就是當機會來臨時，你早已做好了準備。
來自金山詞霸 每日一句
4. If you're lonely when you're alone, you're in bad company.--Jean Paul Sartre
如果你獨處時感到寂寞，說明沒有把自己陪好。
來自金山詞霸 每日一句
5. The turning point in the process of growing up is when you discover the core of strength within you that survives all hurt.