according as，according to
这两个词组虽然相似，但它们的结构和用场所并不相同。according to表示依据、根据；而according as表示视乎，有depending及according to whether的意味。
According as是连词词组，其后接从句；according to 是介词短语，其后接名词。例：
The thermometer rises or falls according to the high or low temperature．
寒暑表依据气温的高低而升降。
They will be praised or blamed according as their work is good or bad．
给他们的赏罚将视乎他们工作的好坏来决定。
应当在此指出，在现代英语中，according as的句型结构已极少有人用，正如 Bergen Evans和 Cornelia Evans在A Dictionary of Contemporary American Usage 中指出的那样：This construction is not often heard today。
下面是according to的例句：
According to the weather report，we shall have cold weather next week．
依据天气报告，下星期天气将要转冷。
You should act according to circumstances．你们要随机应变。
According to有个同义短语，即 in accordance with，但它们的涵义有细微有什么区别，前者强调依据所言，后者则强调与要一致。另外 in accordance with多用于正式场所，比如表示与一些原则、规律一致。例：
According to police report，five luxury cars were stolen in Kowloon yesterday．
依据警方报告，昨天在九龙有五辆豪华汽车被盗。
We must proceed in accordance with the rules．
大家需要根据规章办事。
That sentence is not in accordance with the rules of grammar．
那个句子不符合语法规则。
请注意，in accordance with 既可引导 adverbial phrase，又可引导adjectival phrase作verbto be的补语（见上面 in accordance with的第一和第二个例句）；according to则不可以。比如，大家不可以说：
The news is according to Hong Kong's broadcasting station．（错）
另一点需要补充说明的是，in accord with 和 in accordance with同义，它们可以互换用，但前者远不及后者用得常见。英国学者F．T．Wood觉得，大家最好在强凋与一致（agreement）的时候，用in accord with；在强调服从或遵照实行（obeying or following）的涵义时，用 in accordance with。比如：
What he has done is not in accord with your instructions．
In accordance with your instructions we have suspended work on the heating apparatus1．
