Personnal pronouns : revisions

Object forms of personal pronouns - Exercise

https://www.englisch-hilfen.de/en/exercises/pronouns/personal_pronouns3.htm

Personal pronouns (3) (object)

http://www.cyberteacher.it/esercizi/ing_2pronobj2.htm

SUBJECT AND OBJECT PRONOUNS

http://www.montsemorales.com/gramatica/Objectpronoun.htm