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(2)状语从句的省略 由once，if，as，unless，when，though，although 等引导的状语从句，如果主句主语和从句主语一致，且从句中谓语动词是be＋v.ed或v.ing 形式，或从句中主谓结构为It is (was)＋adj.时，其从句结构可省略为以上连词加v.ed，v.ing或adj.。 ①Once the time is set，it cannot be changed. ＝Once set，the time cannot be changed. 时间一旦被设定就不能更改。 ②When I was waiting for a bus，I met Tom. ＝When waiting for a bus，I met Tom. 我在等车时碰到了汤姆。 ③Though he was young，he knew a lot of English. ＝Though young，he knew a lot of English. 尽管年龄很小，但他知道很多英语。 【即境活用13】 You will be successful in the future________you have a definite goal. A．before B．once C．until D．though [解析]once 一旦……，用来引出条件状语从句。 [答案]B 2．Henry Higgins and Colonel Pickering are sitting deep in conversation. 亨利·希金斯正与皮克林上校坐着进行深入的交谈。 【考点归纳】 deep in sth. 专心；全神贯注；深陷 ①They're deep in prayer. 他们全神贯注于祈祷。 ②He was deep in thought when I saw him. 我看见他时他正陷入沉思。 ③He is often so deep in his books that he forgets to eat. 他常常专心于读书以致忘了吃饭。 ④Absorbed in the book，he didn't notice me enter the room. 陷入读书之中，他没注意到我进入房间。 | 
