1、as for在语体上不如as to 正式,并且着重话题的转换,也就是说,它所引导的是前面尚未提到过的新的事情,因此,它不能用于文章的开头。
例句:As to that, I haven’t decided yet.此时用于句首,不能用as for。关于那件事,我尚未做出决定。
2、as to常常与wh-疑问词引导的动词不定式和名词从句连用(有时可省略),而as for却没有此种用法:
例句:Nobody could decide as to)what to do.谁也不能决定该做什么
1、We have no clue as to where she goes after she left home
我们对她离家後去往何处毫无线索
2、So constructed or contrived as to prevent leaks or leakage.
防漏的为防止裂缝或泄露而制作或设计的
3、Write home as often as possible so as to relieve your mother from anxiety.
尽量多给家里写信, 免得你母亲牵肠挂肚。
4、To conceal traces so as to elude pursuers.
灭迹掩盖痕迹以甩掉追踪者
5、a radar echo displayed so as to show the position of a reflecting surface.
为了指明反射面的位置而显示出来的雷达反射波。