Explanation:
http://www.french-linguistics.co.uk/grammar/past_participle_formation.shtml
hope this help a little I know this topic is hard if you have to do the bon voyage work book then there is a website for the answers
(He talks with everyone in class) El es muy social.
(He gets good grades) El es inteligente.
(He is from Guatemala) El es guatemalteco.
(He also like playing sports). Es deportivo.
(She is always very...) Ella esta siempre bien seria
(She is very...with her students) Es muy estricta con sus estudiantes.
Of course you would include all the proper accents; I am not able to include them because I do not have the right keyboard. Hope this helps.