INVENTION
JOBS IN SCIENCE
https://www.learnenglishfeelgood.com/vocabulary/esl-occupations-scientist.html#google_vignette
https://www.liveworksheets.com/w/en/english-second-language-esl/1468505#google_vignette
SCIENCE: VERB & NOUN COLLOCATIONS
https://quizlet.com/es/764986734/u3-planet-earth-fundraising-verb-noun-collocations-flash-cards/
https://wordwall.net/resource/65080978/science-verb-and-noun-collocations-diversif
IRREGULAR
VERBS
http://www.dad.uncu.edu.ar/upload/irregular-verb-list.pdf
http://www.manythings.org/b/e/2315/
http://tu.tv/videos/esl-irregular-verbs-2
Practice
http://www.esldesk.com/spelling/irregular-verbs
http://esl.fis.edu/grammar/verbs/5.htm
http://www.quia.com/cb/8111.html
http://www.manythings.org/wbg/verbs_past1-mw.html
http://grammar.ccc.commnet.edu/grammar/quizzes/cross/verbs.htm
http://www.macmillandictionary.com/verb_wheel/
http://myeslworld.blogspot.com.es/2010/01/flash-game-past-simple-irregular-verbs.html
PAST PERFECT
Practice
http://www.perfect-english-grammar.com/past-perfect-exercise-1.html
https://www.ego4u.com/en/cram-up/grammar/past-perfect-simple/exercises
https://elt.oup.com/student/solutions/preint/grammar/grammar_09_012e?cc=global&selLanguage=en
http://www.agendaweb.org/verbs/past_perfect-exercises.html
PAST PERFECT / PAST SIMPLE
http://www.usingenglish.com/quizzes/140.html
https://english.lingolia.com/en/grammar/tenses-comparison/simple-past-past-perfect/exercises
http://www.englishexercises.org/makeagame/viewgame.asp?id=6347
http://www.ecenglish.com/learnenglish/lessons/past-simple-or-past-perfect
http://www.perfect-english-grammar.com/past-perfect-exercise-3.html
http://oud.digischool.nl/en/grammatica/pastsimpperf-vraag1.htm
http://www.englisch-hilfen.de/en/exercises/tenses/past_perfect_simple_past.htm
http://www.englisch-hilfen.de/en/exercises/tenses/past_perfect_simple_past.htm
http://www.really-learn-english.com/past-perfect-exercises.html
NEGATIVE PREFIXES
Theory
https://www.learn-english-today.com/lessons/lesson_contents/grammar/prefixes-negative.html
Practice
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-79885.php
https://www.englishrevealed.co.uk/FCE/fce_vocabulary/negative_prefixes_5.php
https://www.usingenglish.com/quizzes/305.html
https://www.englisch-hilfen.de/en/exercises/structures/opposites_adjectives_5.htm
https://www.liveworksheets.com/w/en/english-second-language-esl/44787#google_vignette
RELATIVE CLAUSES
Practice
http://learnenglish.britishcouncil.org/en/english-grammar/pronouns/relative-pronouns
http://www.esl-lounge.com/student/grammar/3g14-relative-pronoun-gap-fill-exercise.php
http://www.agendaweb.org/grammar/relative_pronouns_clauses-exercises.html
http://www.learnenglishfeelgood.com/english-relative-pronouns1.html
http://www.learnenglishfeelgood.com/elt-adjective-clauses-mixed2.html
http://www.englisch-hilfen.de/en/exercises/pronouns/relative_pronouns.htm
http://www.esltower.com/GRAMMARQUIZ/intermediate/relative%20pronoun.htm
QUESTION TAGS
Practice
https://test-english.com/grammar-points/b1/question-tags/
https://www.perfect-english-grammar.com/question-tags-exercise-1.html
https://www.liveworksheets.com/w/en/english-second-language-esl/44669
https://agendaweb.org/grammar/questions_tag-exercises.html