"The shirts are for the students."
Translation:Las camisas son para los alumnos.
I wish!! :) There are several other uses of 'por' and 'para.' With ser/estar, por/para are among the greater obstacles to be overcome when learning Spanish, along with all the "little words" like de, a, el, lo, me, ti, mi, se, lo, le, etc., all the other prepositions, and the subjunctive mood.