when

1. QUEST You use when to ask questions about the time at which things happen. 什么時(shí)候 (用于疑問句，詢問某事發(fā)生的時(shí)間)

When are you going home?

你什么時(shí)候回家？

When did you get married?

你是什么時(shí)候結(jié)婚的？

2. CONJ If something happens when something else is happening, the two things are happening at the same time. (表示兩件事同時(shí)發(fā)生) 當(dāng)…的時(shí)候

When eating a whole cooked fish, you should never turn it over to get at the flesh on the other side. 吃一整條做熟的魚時(shí)，你永遠(yuǎn)都不要把魚翻過來吃另一邊的肉。

3. CONJ You use when to introduce a clause in which you mention something that happens at some point during an activity, event, or situation. 當(dāng)…時(shí) (引導(dǎo)從句，表示從句中提到的事發(fā)生在另一活動(dòng)、事件或情況期間)

When I met the Gills, I had been gardening for nearly ten years. 我結(jié)識(shí)吉爾一家時(shí)，我已經(jīng)幾乎做了十年的園藝。

4. CONJ You use when to introduce a clause where you mention the circumstances under which the event in the main clause happened or will happen. 在…情況下 (引導(dǎo)從句，表示從句中提到的情況是主句中已經(jīng)發(fā)生或即將發(fā)生的事的前提)

When he brought Imelda her drink she gave him a genuine, sweet smile of thanks. 當(dāng)他給艾梅爾達(dá)拿來一杯飲料時(shí)，她給了他一個(gè)真誠、甜美、表示謝意的微笑。

5. CONJ You use when after certain words, especially verbs and adjectives, to introduce a clause where you mention the time at which something happens. 什么時(shí)候 (用在某些詞尤其是動(dòng)詞和形容詞后，引導(dǎo)從句說明某事發(fā)生的時(shí)間)

I asked him when he'd be back to pick me up. 我問他什么時(shí)候回來接我。

6. PRON-REL You use when to introduce a clause that specifies or refers to the time at which something happens. 當(dāng)…的時(shí)候 (引導(dǎo)表示某事發(fā)生的具體時(shí)間的從句)

He could remember a time when he had worked like that himself. 他還記得當(dāng)他自己也像那樣工作的那段時(shí)間。

7. CONJ You use when to introduce the reason for an opinion, comment, or question. 既然 (用于引入觀點(diǎn)、評論、或問題的原因)

How can I love myself when I look like this?

既然我這么一副樣子，我怎么能愛我自己？

8. CONJ You use when in order to introduce a fact or comment which makes the other part of the sentence rather surprising or unlikely. 而 (引出令人吃驚的事實(shí)或評論)

Our mothers sat us down to read and paint, when all we really wanted to do was to make a mess. 我們的媽媽們讓我們坐下讀書、畫畫，而我們真正想要做的卻是胡鬧一陣。