定语从句修饰名词,状语从句修饰动词.在where引导的定语从句中,where本身充当地点状语.where引导的状语从句表明谓语动词发生的地点.
I work in a school where there are a lot of green trees. 我在一所绿树成荫的学校工作.（where there are a lot of green trees紧跟在名词school之后,说明它是修饰school,是定语从句.）
Please put it where there are a lot of green trees. 请把它放在绿树成荫的地方.（where there are a lot of green trees修饰put,表明“放”的地点,是地点状语从句.）
no matter what 可以放在句子中间.如：
When he walked in the forest, no matter what he saw, he didn't pay attention to it and walked on. 他在森林里走的时候,无论看到什么都不去注意它,而是继续往前走.