400-600-1123
关于so that和so as to的语义区别
对于这两个结构，很多同学在做题的时候会有些疑惑，因为同学们上完初高中对这两个结构的理解一般比较浅层，知道它们都是表达如此...以至于的意思，那自然就可以直接换用。但是这里需要提醒同学们的是，so as to do，这里的to do是表示目的性的，也就是说虽然so that和so as to大体意思都是一样的，但是换用到so as to do的时候，需要考虑do的逻辑主语是否可以做出目的性的动作。
我们看两道例题：
Technically , “quicksand” is the term for sand that is so saturated with water as to acquire a liquid’s character.
A. that is so saturated with water as to acquire a liquid's character
B. that is so saturated with water that it acquires the character of a liquid
C. that is saturated with water enough to acquire liquid characteristics
D. saturated enough With water so as to acquire the character of a liquid
E. saturated with water so much as to acquire a liquid character
解析：原句语义：从技术上讲，“流沙”是一个术语，指的是沙子被水浸透，具有液体的特征。
A选项，to acquire的逻辑主语是sand，而流沙并不具有目的性，故排除。
B选项，正确。
C选项，enough，“足以...”改变原句合理的语义。
D选项，enough With water so as to，要么“足以...”要么“如此...以至于”，这里搭配混用。
E选项，saturated with water so much，改变原句合理的语义，原句说的是so saturated浸透的程度，而这里说的是水如此多。
Often major economic shifts are so gradual as to be indistinguishable at first from ordinary fluctuations in the financial markets.
A. so gradual as to be indistinguishable
B. so gradual so that 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
解析：A选项，正确，这里是to be，所以并不具有目的性，只有如此以至于的意思，放在这里语义合理：重大的经济变化是如此渐进的，以至于一开始难以与金融市场的普通波动区分。
B选项，so gradual so that，so多余。
C选项，be unable to是表示有技能，有能力做某事，所以主语一般为有生命物。
D选项，enough，“足以...”改变原句合理的语义。
E选项，enough so that，搭配混用。
12G备考资料