Here you have the list of the famous 4 columns of pronouns you usually get confused with. Click on the links below to practice.
Subject pronouns: They always go before the main verb and, i.e in the first position. Eg He plays football every Monday
Object pronouns: They appear after a preposition (Eg Listen to me) and after a verb (Eg I asked her out but she said no
Possessive adjective: They go before a noun and they mean ‘mi, tu ,su, nuestro, vuestro, suyo’. Eg Your house
Possessive pronouns: They appear after a verb and they mean ‘mío, tuyo, suyo, nuestro, vuestro. Eg This house is yours
Subject Object Possessive adj Possessive pron
I me my mine
You you your yours
He him his his
She her her hers
It it its its
We us our ours
You you your yours
They them their theirs
3rd ESO
http://www.cityu.edu.hk/elc/quiz/pronoun.htm
http://a4esl.org/q/j/ck/mc-pronouns.html
http://a4esl.org/q/h/fb005-bp.html
http://a4esl.org/q/h/9901/jd-pronouns.html
2nd Batxillerat
http://a4esl.org/q/h/vm/pronouns.html