to concentrate on, to use most of your time and effort to do something, to remember, to be able to bring back a piece of information into your mind, or to keep a piece of information in your memory, to think, to use the brain to plan something, solve a problem, understand a situation, etc., to imagine, to form or have a mental picture or idea of something, to wonder, to ask yourself questions or express a wish to know about something, to believe, to think that something is true or correct, to guess, to give an answer to a particular question when you do not have all the facts and so cannot be certain if you are correct, to recognise, to know someone or something because you have seen or heard him or her or experienced it before, to realise, to understand a situation, sometimes suddenly, to suppose, to think that something is likely to be true.

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