whether, if 用法差别总结

2020-03-31 今日热点 阅读

  whether, if

  用法差别总结

  if,even if,whether,unless,but for…

  用法

  whether和if通用,都表现“可否”的意思。通俗来讲,后者比拟正式,在白话中前者经常使用来替换后者。但二者有时具有分歧的暗示。用whether时,正反两面的选择意义较强,问话人其实不在乎回答是必然还可否定;而用if时,则比拟强调双方面,即正面,问话人欲望掉掉落必然的回答。其余,还要留心从以下六个方面的高频考点:

  1、whether和if都可以与or

  not连用; 但whether和or

  not写在一同时,或在动词短语后,只能用whether,不能用if。如:

  2、在引诱宾语从句时,应留心:

  1、表现“可否”时,两词都能引诱宾语从句。

  ①I

  don't know whether/if I will be able to come.我不知道我可否能来.

  ②She asked me whether/if I was interested in working for

  her.她问我可否有兴味为她任务。

  ③We'll be told tomorrow whether we should take the exam or

  not.我们明禀赋知道是否是应当参与测验.

  ④I asked him whether he had done all the work

  himself or whether he had had any assistance.

  我问他这些任务都是他自己做的照样他人帮他做的.

  ⑤I

  wonder if/whether you can examine him now.

  ( 留心: 在两个供选择的从句之间若用or字, 则须重复whether一字. )

  注:

  ⑴当强调宾语从句并将其提早时只能用whether。

  如:Whether I'll have time to go with you I am not

  sure.我很难说我们可否有时间跟你们一同去。

  2、宾语从句移置句首时,用whether,不用if。

  Whether it is true

  or not, I can't say.

  =I can't say whether/if it

  is true or not

  3、宾语从句为否定方法时,平日用if,而不用whether。

  I

  asked Tom if Mary wouldn’t

  come.

  4、动词discuss,decide, consider等后习惯上也经常使用Whether引诱从句,不用if。

  They discussed whether they should leave at

  once.他们评论辩论了可否应当立时离开。

  We discussed whether the house should be

  sold. 我们评论辩论了这房子可否应卖掉落。

  We

  discussed whether we should buy the gift for

  him.

  3、不才列状况下,只能用whether,不能用if。

  1、与不定式连用时,只能用whether.

  He can't decide whether to accept or

  refuse.

  2、在介词后,只能用whether。

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