whether和if都可以引导宾语从句,表示“是否”,在口语或间接引语中两者可以互换使用.如:
I wonder if / whether I can get some advice from you.
Ask him whether / if he can come.
但在有些情况下,whether和if的用法有一定区别.
1.whether引导的从句常可以与连词or或or not直接连用,而if一般不能.如:
正:Let me know whether you can come or not.
误:Let me know if you can come or not.
2.当宾语从句提到句首时,只能用whether引导,而不能用if.如:
正:Whether it is true or not,I can’t tell.
误:If it is true or not,I can’t tell.
3.whether可以引导带to的不定式,if则不能.如:
正:I don’t know whether to accept or refuse.
误:I don’t know if to accept or refuse.
4.whether及其引导的成分可放于介词之后,作介词的宾语,但if不能.如:
正:I worry about whether I hurt her feelings.
误:I worry about if I hurt her feelings.
5.whether可以引导从句,作主语、表语或同位语,而if不能.如:
正:It was uncertain whether he would come.
误:It was uncertain if he would come.
正:His first question was whether Tom had arrived yet.
误:His first question was if Tom had arrived yet.
正:We must consider the question whether we will take these measures.
误:We must consider the question if we will take these measures.
猜你喜欢
- 1数学中自然数,整数,有理数,无理数,实数,素数的概念是什么?
- 2把1立方米的正方体木块的表面涂上颜色,然后切成1立方分米的小正方体,在这些小正方体中,六个面都没有涂色的有多少个?
- 3A、B、C、D的平均数为75,A与B的平均数比C与D的平均数多2,A是90,B是多少?
- 4航天英雄杨利伟的光荣事迹
- 5在三角形ABC中,已知2*向量AB*向量AC=根号3*I向量ABI*I向量ACI=3向量BC的平方,求角ABC的大小【II是绝对值
- 6请将成语填进谚语里:一暴十寒 众擎易举 见异思迁 这山望着那山高( )众人拾柴火焰高( )
- 7最短的季节( ) 最难做的饭( )最遥远的地方( ) 最荒凉的地方( ) 最有学问的人( ) 最长的腿( )
- 8It's time_____football.Let's get ready for it.A.playing.B.to play.C.play.D.plays
- 9等腰直角三角形ABC中,角C等于90度,AC=BC,点P
- 10质点从静止开始做匀加速直线运动,通过连续三段位移作用的时间为3s,2s,1s,则这三段位移时的末速度之比为