一个英语句子不懂,Many guide dogs that have worked for years know all

一个英语句子不懂,
Many guide dogs that have worked for years know all of places their master usually go.
这里的go 后面为什么不加to 如果不加,那么places 和 their 之间不就要用where

1 这里的all of places 本身就相当于where,所以go后面不用加to.
2 places 和 their 之间不是用where,而是that,只是在本句中that被省略了
而已.

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