"so as to" V.S. "so that"！！！

lindaaniu

如题，哪位大牛能详细解释一下这两个短语的用法与区别？

特从987摘题如下：
219.Congress is debating a bill requiring certain employers provide workers with unpaid leave so as to care for sick or newborn children.
(A) provide workers with unpaid leave so as to
(B) to provide workers with unpaid leave so as to
(C) provide workers with unpaid leave in order that they
(D) to provide workers with unpaid leave so that they can
(E) provide workers with unpaid leave and

正解：B

PS:求此题关于so too 的用法！！！
216.    Computers are becoming faster, more powerful, and more reliable, and so too are modems, they are the devices to allow two or more computers to share information over regular telephone lines.
(A) so too are modems, they are the devices to allow
(B) so too are modems, the devices that allow
(C) so too modems, the devices allowing
(D) also modems, they are the devices that allow
(E) also modems, which are the devices to allow
正解：B

shanjun0888

216题，and so too are modems是倒装句，正确语序应该是modems are so too。
因为前面讲到了computer，为了强调modems也是一样，所以倒装。

lindaaniu

214.    Climatic shifts are so gradual as to be indistinguishable at first from ordinary fluctuations in the weather.
(A) so gradual as to be indistinguishable
(B) so gradual they can be indistinguishable
(C) so gradual that they are unable to be distinguished
(D) gradual enough not to be distinguishable
(E) gradual enough so that one cannot distinguish them

还有这道选A,为什么不是C。。。。。

lindaaniu

我错了，219正解是D.......

sunshengkun666

be able to 这个表示 主动，能怎么怎么样，用这被劝的情况下是不合适的...

lindaaniu

thanks !

继续求解中

dawn19

so as to 所修饰的逻辑主语应该与to后动词的逻辑主语相一致。所以使用的时候常常有许多限制。
so that则没有这些限制。b中so as to是作为状语修饰provide的。逻辑主语为employer。不符合原文意思。
个人拙见。