modal verbs

well i realized that i am really bad at using the modal verbs. My partners explained yesterday something about that  and i don´t know if i really don´t know the topic or if i just got confused, i think it was because i was recording the class, the teacher assigned an  activity about the topic and i didn´t know how to fill the gaps ! that was so embarrassed! so i decided to do something about that and i found some explanations about it in my oxford dictionary and now i am a little bit more ready to fill the gaps :D yayy!!  the teacher will explain the topic on Monday! so i am wating. :3