没有规定的,主要是看前后的词.用作介词时to一般用在名词和代词前,表时间,地点,位置,方法等.这题很明显对应的是表方法.
一般来说对应名词的它就是介词,对应动词的就是不定式,如：I like to play football.
to介词的情况总结哪些词里它是介词?the key to solving the problem is …为何用介词
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