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Essay代写:如何正确的使用【Since】?

Dueduedue官方博客2017-11-14essay代写 459 0A+A-

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由于since带有时间及原因的双重意义,如何使用才能避免意思上的混淆?Since 可用来表示原因或时间,而这两个意思在使用上经常被搞混,请见以下例句:

  • A1 Since it was Saturday, I stayed in bed longer.

  • A2 Since she arrived, everything has been different.

例句A1中的since表原因,A2的since则表示自某个时间点以来。

请记住以下四个要点:

  • Since的意思:不管是作为连接词或是介系词,since的意思取决于句子结构和时态。

  • Since作为连接词:附属子句的动词为过去式时,since通常表示时间。

  • Since作为连接词:附属子句的动词为现在式时,since通常表示原因。

  • Since 和for 作为介系词:当事件发生于某一时刻时,使用since;当事件与一段时间相关时,则使用for。此时主要子句的动词通常都是现在完成式。

Since :表示时间

Since通常作为连接词(代入一个子句)或介系词(代入一个片语),偶尔也当作副词(独立存在)。

1. 如果since子句表示时间,子句中的动词必须是过去式。

  • B1 We haven't drunk anything since we got here.

  • B2 We haven't drunk anything since we've been here.

  • B3 I have been feeling sick (ever) since I ate that cake.

2.在一个带有since子句(since you arrived)或since片语(since Tuesday)的句子中,若主要动词指涉一段包含现在的期间,则该动词必须为现在完成式。

  • C1 See examples B1 – B3.

  • C2 I have been there since seven o'clock.

  • C3 Since winning the award, he has been really happy.

3. 如果全句指涉过去的时间,则主要子句需为过去完成式。此时,since 子句的动词通常为简单过去式。

  • D1 We hadn't drunk anything since we arrived .

  • D2 I had been feeling sick ever since I ate that cake.

  • D3 I hadn't drunk anything since seven o'clock.

4.以下情况中的since皆表示时间:(1) since为介系词时(例句C2、D3)、(2) since后面接现在分词时(例句C3)。

5.  Since  还是  for  ?

Since

作为介系词时只能与某一时刻搭配:这里的时刻以副词(如:yesterday)、副词片语(如:the start of term)或动作动词(如:I ate …)表示。

E1 I've been here since last week.

Since

当作介系词时绝对不与一段期间搭配。

我们不能说since three hours,这是错误的用法。

表时间的期间

是以for表示。

E2 I've been here for three hours.

当Since 作为连接词时,便可与一段期间或某一特定时刻做搭配。如果表示一段期间,since子句的动词通常是现在过去式(例句E3a、E4a);如果表示某一时刻,since子句的动词则为简单过去式(例句E3b、E4b)。

E3a I've felt much better since the window has been open.

E4a He has lost weight since he has been running every day.

E3b I've felt much better since I opened the window.

E4b He's lost weight since he stopped eating chocolate bars.

Since :表示原因

1.若since子句为现在式,则since必表示原因,而非时间。

  • F1 Since it is raining, we are staying indoors.

  • F2 We will stay indoors since it is raining.

  • F3 Since he lives in Peru, he doesn't often visit us.

2.若主要子句及since子句中的动词皆为简单过去式,则since通常表原因,而非时间。

  • G1 I ate all the chocolates since you left them behind.

  • G2 Since he was poor, he never took taxis.

Since 表时间时,主要动词通常为现在过去式。

  • G3 I've eaten all the chocolates since I got home.

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