refer to中,to的词性?不定式还是介词?

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refer to中,to的词性?不定式还是介词?

refer to中,to的词性?不定式还是介词?
refer to中,to的词性?不定式还是介词?

refer to中,to的词性?不定式还是介词?
介词
解决这种to的词性可以造句或从字典例句中总结
如造句 Please refer to your preference books if you meet problems.
White-collar workers refers to people who work in offices.
refer to直接加名词,to为prep.

是介词。
有个小诀窍,来判断to的词性。
一般,能在to后面直接加一个名词或者代词的都是介词词性。
当然,加动词原形它必然就是不定式喽。

介词