Personal pronoums.
https://www.englisch-hilfen.de/en/exercises/pronouns/personal_pronouns.htm
Personal pronoums and possessive adjetives.
https://www.englisch-hilfen.de/en/exercises/pronouns/personal_pronouns8.htm
Verb to be.
http://www.eclecticenglish.com/grammar/PresentSimpleToBe1A.html
Verb to have.
https://www.englisch-hilfen.de/en/exercises/tenses/have_to.htm
Question words.
http://www.englishexercises.org/makeagame/viewgame.asp?id=2066
