最直观的区别：
that+从句
to do sth.
so as to 一般加not变成so as not to而用于否定句中
in order to就用在肯定句中
such ...that 和so ... that 要表达的意思一样，都是“太怎么怎么样以至于...”， 只是so后面接的是你要说的形容词或副词，such 后面除了接这些修饰词还要说明你说的对象 举个例子He is so bad that I don't like him 和 He is such a bad person that I don't like him .
so that ...== in order to 表示目的
such as ==for example 表示举例子
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