Modals.

Rephrasing

http://selfaccessgroup.blogspot.com/2015/04/rephrasing-modals.html

http://www.xtec.cat/~ogodoy/sac/rephrasing/modalsex1.htm

https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-103672.php
http://www.ejerciciodeingles.com/ejercicios-transformaciones-verbos-modales-probabilidad/

Grammar

https://www.curso-ingles.com/aprender/cursos/nivel-avanzado/verb-tenses-present-perfect/modal-perfects

http://www.juntadeandalucia.es/averroes/centros-tic/41001461/moodle2/pluginfile.php/2588/mod_resource/content/1/MODAL%20PERFECTS.pdf

http://www.aprendomasingles.com/modales-en-ingles-ejercicios-resueltos-y-comentados/