ENGLISH 4 centro de idiomas.

http://www.englishpage.com/verbpage/verbtenseintro.html

http://www.grammarbank.com/verb-tenses-practice.html

Poses sirve and genitivo

http://www.agendaweb.org/grammar/apostrophe-genitive-case.html

http://www.agendaweb.org/grammar/apostrophes-worksheets-resources.html

http://www.agendaweb.org/grammar/apostrophe-genitive-case.html

When and while

http://www.englishtenses.com/test/when_or_while_test

https://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex04

https://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex07

https://elt.oup.com/student/project3rdedition/level5/unit1/grammar/exercise1?cc=us&selLanguage=en

Guía examen extra inglés 3 2017

This that these those

http://www.agendaweb.org/grammar/demonstratives-exercises.html

Can can't

http://www.agendaweb.org/verbs/can-exercises.html

going to

http://www.agendaweb.org/verbs/future-be-going-to-exercises.html

Adverbs

http://www.agendaweb.org/grammar/adverbs-exercises.html