英语方面的,很简单的

think about
v.
考虑, 回想

举例：will you come tomorrow? i'll think about it.
你明天会来吗？我会考虑的。

think of
v.
考虑, 关心, 想起, 想象, 有...的看法, 记起

举例：she has been thinking of you ever since the day you left.
自从你离去的那一天开始，她一直在想着你。（想起你）

what have you been thinking of? 你在想什么？

think over
v.
仔细考虑, 重新考虑

举例：i will think it over and give you an answer tomorrow.
我会重新考虑，明天再给你答案。

think about
v.
考虑, 回想
think of
v.
考虑, 关心, 想起, 想象, 有...的看法, 记起
think over
v.
仔细考虑, 重新考虑