Be going to / will / present continuous / present simple
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http://www.servator.cat/eva/index_files/Grammar/2ndcycle/4tESO/futures1.htm
http://www.servator.cat/eva/index_files/Grammar/2ndcycle/4tESO/futures2.htm
http://www.servator.cat/eva/index_files/Grammar/2ndcycle/4tESO/futures3.htm
https://www.ego4u.com/en/cram-up/grammar/future-mix/exercises
Will + may + might
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http://www.eli.es/uploaded_files/practice/t4/exercises/oldt4jpredict/oldt4jpredict.htm
https://elt.oup.com/student/englishfile/intermediate/a_grammar/file03/nef_int_grammar03_b0
1?cc=global&selLanguage=en
https://elt.oup.com/student/englishfile/intermediate/a_grammar/file03/nef_int_grammar03_b0
2?cc=global&selLanguage=en
1st, 2nd conditionals (affirmative, negative, and interrogative)
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http://www.english-area.com/paginas/Firstandsecondconditional.htm
https://www.ego4u.com/en/cram-up/tests/conditional-sentences-2
https://speakspeak.com/english-grammar-exercises/intermediate/first-versus-secondconditional
https://www.liveworksheets.com/worksheets/en/English_as_a_Second_Language_(ESL)/Con
ditional_sentences/ZERO,_FIRST,_AND_SECOND_CONDITIONALS_kd1447hm
http://www.studypro.eu/english-grammar/1st-and-2nd-conditionals-test-a.html
http://www.studypro.eu/english-grammar/1st-and-2nd-conditionals-test-b.html
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http://www.studypro.eu/english-grammar/1st-and-2nd-conditionals-test-c.html
http://englishgrammarexercise.com/first-second-conditional-sentences-statements-exercise-1/
Passive voice (Present and past simple)
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https://www.liveworksheets.com/worksheets/en/English_as_a_Second_Language_(ESL)/Pas
sive_voice/Present_simple_and_past_simple_passive_voice_xb73qd
https://www.liveworksheets.com/worksheets/en/English_as_a_Second_Language_(ESL)/Pas
sive_voice/Passive_Voice_(present_and_past_simple_tenses)_ac5270ga
https://www.liveworksheets.com/worksheets/en/English_as_a_Second_Language_(ESL)/Pas
sive_voice/Passive_Voice*_Simple_Present_and_Simple_Past_ar17784sz
https://www.english-4u.de/en/grammar-exercises/passive2.htm
(varios) https://engelsklaslokaal.nl/en/english-grammar-exercises/passive/simple-past-passive/
Reported speech
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https://www.examenglish.com/grammar/B1_reported_speech.htm
(varios) https://www.perfect-english-grammar.com/reported-speech-exercises.html
https://www.ego4u.com/en/cram-up/grammar/reported-speech/exercises?10
https://www.ego4u.com/en/cram-up/grammar/reported-speech/exercises?11
https://www.e-grammar.org/reported-speech/test1-exercise1/
https://www.usingenglish.com/quizzes/102.html
https://firstenglish.org/english_learning/reported_speech/150_test_reported_speech_english.htm
https://todayschool.es/grammar/reported-speech-questions-imperatives-and-requests/
Present perfect + still, yet, already, just
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https://www.curso-ingles.com/practicar/ejercicios/already-just-still-yet-2
http://www.autoenglish.org/gr.presper.i.htm
https://www.aprenderinglesgo.com/ejercicios-just-already-yet-still-2774
http://www.esl-lounge.com/student/grammar/2g7-just-yet-already.php
https://www.proprofs.com/quiz-school/story.php?title=already-yet-and-just
http://www.better-english.com/grammar/stillyet.htm
Present perfect and past simple
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https://web2.uvcs.uvic.ca/courses/elc/studyzone/410/grammar/ppvpast1.htm
https://www.englishpage.com/verbpage/verbs5.htm
https://www.curso-ingles.com/practicar/ejercicios/present-perfect-vs-past-simple
https://www.curso-ingles.com/practicar/ejercicios/present-perfect-vs-past-simple-2
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https://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect.htm
http://www.saberingles.com.ar/curso/lesson21/06.html
http://www.ejerciciodeingles.com/ejercicios-uso-present-perfect-past-simple-rellenar-huecos/
https://www.ejerciciosinglesonline.com/exercises-and-theory/ex6-present-perfect-vs-pastsimple/
https://www.learn-english-today.com/lessons/lesson_contents/exercises/present-perf_pastsimple-gapfill-ex.html
https://firstenglish.org/english_learning/english_tenses/comparison_tenses/20_simple_past_or_present_
perfect.htm
https://www.liveworksheets.com/worksheets/en/English_as_a_Second_Language_(ESL)/Past
_simple/PAST_SIMPLE_or_PRESENT_PERFECT$_zm848jp
https://www.liveworksheets.com/worksheets/en/English_as_a_Second_Language_(ESL)/Pres
ent_perfect_or_past_simple/Past_Simple_vs_Present_Perfect_oz6212fm
Past perfect, past simple & past continuous
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https://www.test-english.com/grammar-points/b1/past-simple-past-continuous-past-perfect/
https://www.brickfieldidiomas.com/past-simple-past-perfect-and-past-continuous/
http://www.ice.urv.es/eoiact/level3/narrativetenses1.htm
https://www.superprof.es/apuntes/idiomas/ingles/gramatica-inglesa/verb-tense/exercisespresent-and-past-simple-continuous-and-perfect.html
https://webcache.googleusercontent.com/search?q=cache:z4VqZkxT_IMJ:https://www.britan
nia-school.com/past-simple-continuous-perfect-b1/+&cd=32&hl=es&ct=clnk&gl=es
https://www.gynome.cz/fls/dum/aj/09/09_Past_tenses.htm
https://bbresources.s3.amazonaws.com/sites/3/Grammar-PastSimpleContPerfect_2664.pdf