Here you have some links in which you can practise your grammar exercises:
6th course of Primary Unit 1
· Verb “Can” :
Grammar explanation:

https://www.youtube.com/watch?v=zFdazgM7r-8

Exercises:

https://www.englisch-hilfen.de/en/exercises/modals/can2.htm

https://www.englisch-hilfen.de/en/exercises/questions/can2.htm

http://learnenglishkids.britishcouncil.org/en/grammar-practice/modals-can-and-cant

http://www.esl-lounge.com/student/grammar/1g102-elementary-can-cant-exercise.php

http://firstenglish.org/english_learning/english_beginners/can_can_t_exercises/02_can_english_grammar_exercise.htm

· Possessive pronouns and adjectives:
Grammar explanation:

Exercises:

https://www.ego4u.com/en/cram-up/grammar/pronouns/exercises?04

https://www.learnenglishfeelgood.com/possessive-pronouns-adjectives2.html

https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-27557.php

http://www2.arnes.si/~oskksavokl2/possessive.htm

http://www.myenglishpages.com/site_php_files/grammar-exercise-possessive-adjectives.php

· Interesting web pages with grammar, videos and games.

http://primary.oolz.oupe.es/

http://kids.nationalgeographic.com/

https://learnenglishkids.britishcouncil.org/es (if you work on activities from this page, you can get a possitive point. Remember to watch a video, read the text or write a composition. Then print the pdf document and hand in to your english teacher)