based on 放在句首的用法

based on作为非谓语动词，放在句首作状语，表示“基于…”。如：Based on the datas，the scientists drew a conclusion.其句型结构为：过去分词，+句子。

Faced with the difficulties，he showed great determination. 又如：Scolded by his father，Jack felt very guilty. 

based on放在句首即作状语，如①Based on a true story， the movie has received high praises since its release.②Based on his previous study， the author wrote a book about the popularity of themachine.在英语中，这种非谓语动词作状语的情况有很多，如Absorbed in reading，he did not notice the teacher come in.

片语 based on 和 on the basis of 经常被交互使用，然而，这是不正确的。因为 based on 是分词（口语形容词），用来定义名词、代名词和名词片语而非动词，on the basis of 才是用来定义动词的介词片语。当 based on

用作被动态时，具有动词或形容词的功用，可修饰名词或代名词（通常紧接在片语前）。

例句：

˙ This conclusion is based on four years of experience.

˙ Conclusions based on experience may still require testing.

若要修饰动词，请使用其他的片语，如 on the basis of。