/ɪnˈfɪnətɪv ||; ɪnˈfɪnətɪv/noun [C] (
grammar语法) the basic form of a verb （动词的）不定式，不定词
In English the infinitive can be used either with or without to depending on what comes before it He can sing. He wants to sing. 英语的动词不定式后面接不接to取决于前面的成分：He can sing.他会唱歌。·He wants to sing.他想唱歌。