occur 的用法判断

各位老师好，请问这个句子中动词occur符合语法规则吗，base on 后面接的是句子吗？

A biotechnology company is developing a range of new pesticide based on naturally occur toxin.

修改如下，注意红字

A biotechnology company is developing a range of new pesticides based on naturally occurring toxins.

1）Pesticide与toxin用复数

2）occurr动词不能直接修饰名词，必须改为非限定动词格式，用occurred不行，因为它是不及物动词，表示已经发生生成的有毒物质，仔细想和句意是矛盾的。用V-ing格式正确，意思也通，表示toxin的性质 toxins which naturally occur.

mikee -

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wt 1秒前

这明显是个错句。

更改一下：A biotechnology company is developing a range of new pesticide based on toxin which occurs naturally.....。

你再结合原文看一下。