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2015年MBA备考冲刺英语:英语语法概述(五)

2014-01-23 14:14:15来源:233网校

  (一)时间状语从句

  When you cross a main road, you must be very careful.

  Until we learn the facts, we can’t do anything about it.

  [提示]

  1. when, as, while引导时间状语从句时都可以表示主句的动作与从句的动作同时发生, 即同时性。它们的区别在于:

  when和as引导的状语从句中的动作既可以是延续性的, 也可以是非延续性的, 即瞬时性的;

  while引导的状语从句中的动作只能是延续的动作或状态。

  当主句和从句中的动作均为延续动作时, 一般用while, 而不用when或as。当表示两个同时发展、变化的情况时, 一般用as, 作“随着…”解。

  When she comes, I shall tell her to wait for you.

  As she got older, she got wiser.

  While Peter was reading, his wife was cooking.

  2. 有些副词和一些表示时间的名词词组也可用作从属连词,引导时间状语从句。如instantly, immediately, directly, the day, every time, the minute, the second, the moment等。

  Immediately he arrived, he started describing us what had happened.

  The day he returned home, his grandpa was alrady dead.

  (二)条件状语从句

  引导条件状语从句的从属连词有:

  if, unless, as (so) long as, only if(只要)。

  If you don’t come on time, we’ll start out without you.

  As (so) long as you keep on trying, you’ll certainly succeed.

  [提示]

  除了以上提到的从属连词外, 还有其它的一些词或词组也可引导条件状语从句。

  如: providing that, provided, supposing that, suppose that, on condition that, in case等。

  Provided (that) he wins the support of the minority groups,he will be able to win the electrion.

  I will go providing that my expenses are paid.要是我的费用有人代付我就去

  Supposing he is not at home, what then?假如他不在家,那怎么办? :

  You can use the bicycle on condition that you return it tomorrow.只要你明天归还,自行车你可以拿去用。

  In case she comes back, let me know immediately.假使她回来了,立刻告诉我

  Take the raincoat in case it rains.带着雨衣,以防下雨。


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