look up,look out ,look for，look after什么意思

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ook after表照顾,如：He looked after his sisterlook up 一般指在字典里查找单词什么的,look up the word in the dictionary.look for 指寻找,更倾向于找的过程,动作,（顺便提一下）find也是寻找,但更倾向于结果.I looked (look的过去式）for my shoes ,but I couldn't find them .look over 多指检查,考试检查之类的Please look over your exam paper carefully.