同意刘老师解答：

(1)think over 是一个短语动词作谓语，意思，仔细考虑; 重新考虑; 掂掇; 忖量，反复考虑

Phrasal Verb仔细考虑;认真思考 （英文解释：If you think something over, you consider it carefully before making a decision.）

She said she needs time to think it over.

她说，她需要时间好好想一想。

I suggest you think over your position very carefully.  

我建议你认真考虑一下你的处境。

Think over the matter and then make a decision.  

这件事情斟酌斟酌再定.

I must think over this, I have known for years that it was in the cards.  

我得仔细考虑考虑,许多年来, 我就知道这是可能的.

(备注：动词+副词构成短语动词，如果宾语为代词必须放在中间，如果是名词，中间和后面都可以。）

(2)afterwards 是一个时间副词作时间状语，意思“后来， 然后，后来地;  之后;”

adv/（某个事件或已提及的时间）之后（英文解释： If you do something or if something happens afterwards, you do it or it happens after a particular event or time that has already been mentioned.）

Shortly afterwards, police arrested four suspects.

之后不久，警方逮捕了4名嫌犯。

James was taken to hospital but died soon afterwards. 

詹姆斯被送往医院，但随后不久就死了。

Suffice it to say that afterwards we never met again.  

简单地说，此后我们再也没有见过面。

She wondered where they were going to rendezvous afterwards.  

她想知道之后他们要去哪里约会。

When she thought it over afterwards, it occurred to her that she ought to have wondered at this, but at the time it all seemed quite natural.

老师，over afterwards，它们俩都是副词吗？它的语法成分如何理解？

【答】thought it over （thought over是“动词+副词”型短语）；afterwards 是副词，作时间状语，意思是“后来”。不能把over afterwards放在一起分析。