(1) ①think out 可作“想出”解，与think of(表示“想出”时)同义。(另见“think of...”条)

• Have you thought out the best method to deal with the problem?
  你想出处理问题的最佳方法了吗？
• I can't think of/out how to get out of this difficulty.
  我想不出如何摆脱这一困境。

②think out 还作“缜密考虑，想清楚”解。

• All possible ways out of our difficulty have now been thought out .
  对所有可能摆脱我们困境的方案都已做了缜密考虑。
• The question is very difficult. I must think it out when I have more time.
  这个问题很棘手，我有时间一定把它想清楚。

 (2) ①think over指“仔细考虑”，常意味着个人单独地考虑。

• I need a couple of days to think this matter over .
  我需要几天时间仔细考虑一下此事。
• He likes to go into his studies by himself to think things over .
  他喜欢独自在书房里思考问题。

②think over还作“重新考虑”解，常含有改变意见的意味。

• I've thought the plan over and decided not to join it after all.
  我对计划又做了重新考虑，决定还是不参加了。

 (3) think through 指“想明白，想通”。

• Now that we've thought through the matter, can we come to a decision?
  既然我们都想通了此事，该做决定了吧？
• Think it through carefully before you give me your final decision.
  仔细想明白了再告诉我你的最后决定。

 (4) think again指“重新考虑；改变主意”。

• The sudden drop in house prices has made me think again about selling the house.
  房价突然下跌，让我重新考虑是否还要卖房。

 (5) think twice表示“重新考虑，再三考虑，三思”，常与about或before连用。

• I'd like to think twice about the contract before signing it.
  签约之前我得再考虑考虑。
• Always think twice before you take action.
  三思而后行。
• If I were you, I'd think twice about/before investing my money in that firm.
  如果我是你，我会在对此公司投资之前进行慎重考虑。

 (6) think better of可作“重新考虑，改变想法，另做决定”解。(另见“think nothing of...”条目)

• It's a foolish idea, I hope you'll think better of it.
  这是个愚蠢的想法，我希望你再好好考虑一下。
• She was going to write a letter of complaint, but she thought better of it, and decided to wait a few days.
  她本打算写封投诉信，但想了想又改变了主意，决定再等几天看看。