think about
考虑；思考（某事）
例句：I need some time to think about your offer.
think of
想到；想起；对……有看法
例句：Can you think of a good reason to go?
例句：What do you think of this movie?
think over
仔细考虑；慎重思考
例句：Please think it over before making a decision.
think through
彻底想清楚；通盘考虑
例句：We need to think through all the possible consequences.
think up
想出（主意、计划等）
例句：She thought up a brilliant solution to the problem.