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ope电竞app官网语法之"since"的用法 

发布时间:2018/04/03

一直以来,英语中复合句的写作对很多学生来说一直是一个不小的难题。尤其是引导词"since"的用法更是让大家头疼不已,因为它既可以引导时间状语又可以引导原因状语从句,到底如何区分呢?下面就为大家详细整理一下"since"的各种用法。

  1. since译作"自从…以来"

  (1) 接时间点,谓语v. 用现在完成时,而且须是延续性动词;

  如 I have stayed in that country since 1995.

  (2) 接一段时间+ ago,谓语v. 用现在完成时,而且须是延续性动词;

  如 They have lived in that house since two years ago.

  (3) 接时间状语从句,主句的谓语v. 用现在完成时,而且须是延续性动词;从句的谓语v.用一般过去时,而且须是终止性动词;

  如 I have loved her since I met her last time./ Lily has stayed at home since she left school.

  (4) 用于句型"It's / It has been + 一段时间 + since + 时间状语从句"中,译作"自从......以来,已经......(时间)了"。主句的谓语v. 用一般现在时或现在完成时,从句的谓语v. 用一般过去时,而且须是终止性动词;

  如 It's / has been three months since he moved to this city.

  (5) 用于句型"一段时间 + has passed since + 时间状语从句"中,译作"自从......以来,......(时间)已经过去了"。主句的谓语v. 用现在完成时,而且动词必须是has passed;从句的谓语v.用一般过去时,而且须是终止性动词;

  如,上个例句还可写成:Three months has passed since he moved to this city.

  (6) 当since用于否定句时,主句的谓语v. 可以是终止性动词;

  如 He hasn't seen the film since last month.

  (7) 相关词组:

  "从那时起":ever since/ since then/from then on

  注:ever since作为一个词组,放句尾可单独使用。如I have given up smoking ever since.另外还可在since后接句子,since前加eve,只是加重语气而已。如 I have given up smoking ever since I caught a bad cough.

  2. since译作"由于,因为"

  (8) since还可引导原因状语从句,相当于because。

  如 Since he was lazy,he didn't finish his homework.

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