问题的关键是：go over短语中，go是不及物动词，over是介词，意为：穿过，跨过，越过。

(If someone or something goes over a barrier, obstacle, or boundary, they get to the other side of it by going across it, or across the top of it.)

据此解释，go over取其比喻义：仔细检查；认真讨论；用心思考 (If you go over a document, incident, or problem, you examine, discuss, or think about it very carefully.)

这里的go over，无论接名词还是代词，一律放在over之后。原因是，go是不及物动词，不能直接跟宾语。

你说的turn it over, think it over中，turn和think是及物动词，over是副词。这时，名词或代词都可放在中间无妨。