until 的用法 壹, 介詞 until 作介詞的 until 的英文解釋是 up to a specified time (直到某壹時刻)或 up to the time of a specified event (直到發生某事).但註意觀察下列句子,我們還可留意到 until 在具體運用中 的細微之處. 1. 用於肯定句中: 1) It may last until Friday. 這可能要延續到星期五. 2) He will be working until 5 o'clock. 他將壹直工作到五點鐘. 3) She was a bank clerk until the war, when she trained as a nurse. 她戰前是個銀行職員, 戰時 受訓當了護士. 不難看出 until 用於肯定句中,表示句子的動作壹直持續到 until 短語所表示的時間為止, 即表示動作的終點.壹般可譯為"直到……時(為止)"或"在……以前" .在這種用法中, 句子的謂語動詞必須是持續動詞(非瞬間動詞),如 live, wait , last, love, like, stay, work, continue 等. 二, 連詞 until 以同樣的方式分析作連詞的 until 的用法.作連詞用的 until 的英文釋義是 up to the time when(直到……時為止). 1. 用於肯定句中: 1) Heat can be conducted from a hot body to a cooler one until both are at the same temperature. 熱可以從壹個熱的物體傳到壹個較冷的物體,直到兩者溫度相同為止. 2) Continue in this direction until you see a sign. 壹直朝著這個方向走就會看見指示牌了. 3) He ran until he was breathless. 他壹直跑到氣喘籲籲才停下. 不難看出,作連詞的 until 用於肯定句中,表示主句的動作壹直持續到從句動作發生或狀 態出現時為止.壹般可譯為"……直到……為止" .在這種用法中,主句的謂語動詞必須是 持續動詞(非瞬間動詞),如 live, wait , last, love, like, stay, work, continue 等. 2. 用於否定句中: 1) I hadn't realized she was foreign until she spoke. 她不說話我還壹直不知道她是個外國人. 2) I won't stop shouting until you let me go. 妳不放我,我就壹直喊叫. 3) Among the great mathematicians there are about as many who showed mathematical talents in childhood as there are those who showed none at all until they are older. 在偉大的數學家中, 童年就顯露數學才華的人和直到相當年齡才顯露才華的人差不多壹樣多. 不難看出, 作連詞的 until 用於否定句中, 從句先發生, 主句再發生. 壹般可譯為 "直到…… 才" .
attention：壹,until與by的區別 1. by表示在某特定的時間之前或不遲於某特定的時間,意為"最遲在;不遲於"或"在……之 前"等.如: ①I will finish my task by nine.我將在九點鐘前完成任務. ②The plane takes off at 10:00, so you must try to be at the airport by 9:30. 飛機在十點鐘起飛,所以妳必須在九點半趕到機場. 2. until用在肯定句,謂語動詞通常是延續性動詞,如stand, stay, talk, wait等,表示主 句動作終止的時間.如: ③I waited until he came back.我壹直等到他回來. ④The war lasted until 1945.戰爭持續到1945年. 如果用在否定句,謂語動詞通常是瞬間性動詞,如open, start, leave, arrive, finish, stop等,強調主句動作開始的時間.如: ⑤I didn't leave the boy until his mother turned up.直到這孩子的母親來,我才離 開. ⑥The noise of the street didn't stop until it was midnight.街上的噪音直到半夜 才停止. 二,until與before的區別 1.可直接換用的情況:在until能使用的句型中,即主句含有否定式終止性謂語動詞或肯定式 延續性動詞,可與before直接替換,意義差別不大.如: ①The students won't go home until / before they finish their homework.學生們 要先完成作業才能回家. ②The woman worked in the factory until/before 1990. 1990年以前這婦女在這家工 廠上班. 2.不可換用的情況:當主句含有肯定式終止性謂語動詞時,只能用before不能用until,且 before常意為"沒來得及……"或"……才……"等.如: ③Einstein almost knocked me down before he saw me.愛因斯坦差不多將我撞倒才看 見了我. ④He had measured me before I could get in a word.我還沒來得及插話,他就把我的 尺寸量好了.
引用他人，絕非原創，只是資源***享 O(∩_∩)O~~