消しゴム

How it works

A casual request. The verb 返す(かえす) (give back) shifts to its て (te-form) 返して(かえして) (give back), which alone can ask someone to do something between friends. The final よ (emphasis) pushes a little — "come on, give it back". The object 消しゴム(けしゴム) (eraser) sits before the verb with no particle, as casual speech allows.