think
think over和think about的区别是意思不同、用法不同。think over意为仔细考虑，后接名词或代词作宾语。think about可接名词、动词ing形式或由疑问词引导的不定式或宾语从句，表示考虑……。
例句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。It was a difficult situation, when you think about it.仔细想来，当时处境是很困难的。