Should must need to

http://learnenglishteens.britishcouncil.org/grammar/beginner-grammar/have-must-should-obligation-advice

https://www.thoughtco.com/must-have-to-and-need-to-in-english-4177288

https://www.businessenglish.com/grammar/modals-must-have-to-should-should-have.html?lang=spa

Past Simple and Continuous (5th Grade)

https://www.youtube.com/watch?v=0_lrUe7sAAc

https://www.perfect-english-grammar.com/past-simple-past-continuous-exercise-1.html

https://www.perfect-english-grammar.com/past-simple-past-continuous-exercise-2.html

listening exercises

http://www.eslgamesplus.com/action-verbs-nouns-collocation-esl-vocabulary-pirate-board-game/

SABER INGLÉS

http://www.saberingles.com.ar/games/index.html

ADELE´s CORNER

http://www.educa.jcyl.es/crol/es/repositorio-global/vocabulario-gramatica-pronunciacion-ingles-primaria