2013年职称英语考试语法指导：名词从句(4)

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2013年职称英语考试语法指导：名词从句(4)
　（2）whether和if的用法。
+ d8 C" P& M* @4 E& s　　①whether和if在宾语从句中可以互换，但是作介词宾语时连接词一般用whether。如：
　　It all depends on whether they will come back.
　　②后面直接跟or not 时用whether。如：
+ {8 h' ]/ L: k　　I didn’t know whether or not he had arrived in Wuhan.
- i5 E: `0 A% }3 D0 j& f* r# d" y. w　　③主语从句表语从句中只能用whether。如：
　　Whether the meeting will be put off has not been decided yet.
　　The question is whether they have so much money.
! Q, m) F" o* Q( Q　　④whether可以引导同位语从句，用以说明前面的名词的内容，if不能。如：
　　We ought to discuss carefully the question whether we can do it or not.
% a7 L! e( m. h& o! Q* Z  P　　⑤whether常与or连用表示一种选择，if不能这样用；whether也可与动词不定式连用但if不能。如：The question of whether they are male or female is not important.
　　I have not decided whether to go or not.
9 F, e" C; |5 A6 Y# V: {9 x　　⑥间接引语位于句首时或者是间接引语提前时用whether不用if。如： www.Examw.com
  H) y. K* G6 t; K　　Thank you, but whether I’ll be free I’m not sure at the moment.
　　⑦whether可引导一个让步状语从句表示“不管”、“无论”，而if不能。如：
- O+ W6 }( w" T8 x/ h　　Whether he comes or not, we will begin our party on time.