From what principal part does the present active infinitive come? this is for latin

Which quote from little women best exemplifies the theme of making sacrifices for genuine love? "’i don't want a fashionable wedding, but only those about me whom i love, and to them i wish to look and be my familiar self.’" “’but hug and kiss me, everyone, and don't mind my dress. i want a great many crumples of this sort put into it today.’” “jo did not cry, though she was very near it once, and was only saved from a demonstration by the consciousness that laurie was staring fixedly at her, with a comical mixture of merriment and emotion in his wicked black eyes.” “’don't feel that i am separated from you, marmee dear, or that i love you any the less for loving john so much’”