Verb "can"

Explanation
http://www.englishclub.com/grammar/verbs-modals_can_1.htm
http://www.englishpage.com/modals/can.html

Excercises
http://saberingles.com.ar/curso/lesson13/05.html
http://www.englisch-hilfen.de/en/exercises/questions/can2.htm
http://elt.oup.com/student/englishfile/elementary/a_grammar/file04/grammar04_01a?cc=hu&selLanguage=hu
http://elt.oup.com/student/englishfile/elementary/a_grammar/file04/grammar04_a02?cc=hu&selLanguage=hu

Verb "like" and "would like"

http://elt.oup.com/student/headway/elementary/a_grammar/unit09/hwy_elem_unit09_1?cc=global&selLanguage=en
http://elt.oup.com/student/englishfile/elementary/a_grammar/file04/grammar04_b01?cc=hu&selLanguage=hu
http://elt.oup.com/student/englishfile/elementary/a_grammar/file04/grammar04_b01?cc=hu&selLanguage=hu

Object pronouns

Explanation
http://www.englisch-hilfen.de/en/grammar/pronomen.htm

Exercises
http://elt.oup.com/student/englishfile/elementary/a_grammar/file04/grammar04_c01?cc=hu&selLanguage=hu
http://elt.oup.com/student/englishfile/elementary/a_grammar/file04/grammar04_c02?cc=hu&selLanguage=hu
http://www.englisch-hilfen.de/en/exercises/pronouns/personal_pronouns3.htm

Possessive pronouns

Explanation
http://www.saberingles.com.ar/curso/lesson16/04c.html
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/poss.htm

Exercises

http://www.ego4u.com/en/cram-up/grammar/pronouns
http://elt.oup.com/student/englishfile/elementary/a_grammar/file04/grammar04_d01?cc=hu&selLanguage=hu
http://elt.oup.com/student/englishfile/elementary/a_grammar/file04/grammar04_d02?cc=hu&selLanguage=hu