作业帮He does exercise _____ keep fit用什么介词
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He does exercise _____ keep fit用什么介词
应该填to.
不过to在这儿不是介词,是动词不定式的标志,to keep fit作目的状语.
整句话意思：他运动是为了保持健康.
再问： 为什么不用for
再答： 如果填for，后面应该说成for keeping fit（因为for是介词，后面不能跟上动词原形，要用doing） 另外，如果表示目的，for后面只能加上名词，不能跟上doing，如：He came here for the tickets.（比较：He came here to buy the tickets.) 除非在固定搭配中用for的后面可以跟上for doing，如：Tom was praised for cleaning the room after the party was over.（在这个句子中不能说Tom was praised to clean the room ...)
不过to在这儿不是介词,是动词不定式的标志,to keep fit作目的状语.
整句话意思：他运动是为了保持健康.
再问： 为什么不用for
再答： 如果填for，后面应该说成for keeping fit（因为for是介词，后面不能跟上动词原形，要用doing） 另外，如果表示目的，for后面只能加上名词，不能跟上doing，如：He came here for the tickets.（比较：He came here to buy the tickets.) 除非在固定搭配中用for的后面可以跟上for doing，如：Tom was praised for cleaning the room after the party was over.（在这个句子中不能说Tom was praised to clean the room ...)
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