语法解惑：prefer sth based on

原文：
They prefer it based on an outdated first-impression that the new systems had some bugs and some programs like PlayOn and Plex didn't work.

为什么用“They prefer it based on ”，而不是they prefer it IS based on“？
同样是这个问题的还有：Do you prefer world map themes changing based on location or plot-based time?

多谢！！

原文：
They prefer it based on an outdated first-impression that the new systems had some bugs and some programs like PlayOn and Plex didn't work.

为什么用“They prefer it based on ”，而不是they prefer it IS based on“？
同样是这个问题的还有：Do you prefer world map themes changing based on location or plot-based time?

多谢！！
答：没有找到你的原文出处，不清楚原文的意思。但我可以给你一个思路，供参考。
本句中的prefer 的宾语有两个，一个是形式上的it,另一个是从句，真正的宾语--that从句，而且此从句用的是虚拟语气（用过去时态表示had ..., didn't work),类似于句型：They'd rather (that) sb. did sth. 意为：他们宁愿XX做某事。based on ...是一个过去分词短语作状语，这里是插入语，正是因为它的关系，句子才需要这个形式宾语和that-从句这个真正的宾语。
此句=Based on ..., they prefer that -从句。
后一问题based on短语作用类似，prefer的宾语是一个带逻辑主语的动名词短语。

prefer用法:prefer doing/prefer doing to doing/prefer sth/prefer sth to sth “They prefer it based on ”中的it是形式宾语,真正的宾语在前句或后句中.“They prefer it based on ”是简单句,而"they prefer it IS based on“是复合句,宾语从句省略that

正确。前后位并列成分，同等，同性。前面有的可以省略。 prefer to do rather than do 宁愿做---而不愿做--- i prefer beef rather than mutton.

我宁愿吃牛肉也不愿吃羊肉。

and you have to walk up ten minutes to the building, yes, there's mini bus, but i prefer walking rather than taking minus bus.

其实比起我那一星期才用10磅的爱丁堡好友，她的生活已经叫人羡慕了。 "i prefer real literature rather than imaginary works," added the 20-year-old. “我更愿意读真实的文学而不是想象的作品，”这位20岁的女孩补充道。

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