based on 放在句首的用法

based on作為非謂語動詞，放在句首作狀語，表示“基於…”。如：Based on the datas，the scientists drew a conclusion.其句型結構為：過去分詞，+句子。

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

based on放在句首即作狀語，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.在英語中，這種非謂語動詞作狀語的情況有很多，如Absorbed in reading，he did not notice the teacher come in.

片語 based on 和 on the basis of 經常被交互使用，然而，這是不正確的。因為 based on 是分詞（口語形容詞），用來定義名詞、代名詞和名詞片語而非動詞，on the basis of 才是用來定義動詞的介詞片語。當 based on

用作被動態時，具有動詞或形容詞的功用，可修飾名詞或代名詞（通常緊接在片語前）。

例句：

˙ This conclusion is based on four years of experience.

˙ Conclusions based on experience may still require testing.

若要修飾動詞，請使用其他的片語，如 on the basis of。