will (future)

http://members.iinet.net.au/~adelegc/grammar/will/will_neg.html

will (future)

http://www.ego4u.de/de/cram-up/grammar/future-1-will/exercises

will (future)

http://members.iinet.net.au/~adelegc/grammar/will/will.html

going to: future

http://www.englisch-hilfen.de/en/exercises/tenses/going_to_future_negation.htm

was/were

http://www.oup.com/elt/global/products/englishfile/elementary/a_grammar/file05/grammar05_a01/

was/were

http://www.carmenlu.com/first/grammar/pastbe1_5.htm

was/were

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-2570.php

was/were

http://www.oup.com/elt/global/products/headway/beginner/a_grammar/grammarunit09/hwy_begin_unit09_1/

was/were

http://www.tolearnenglish.com/exercises/exercise-english-1/exercise-english-578.php

was were

http://www.tolearnenglish.com/exercises/exercise-english-1/exercise-english-578.php

was/were

http://www.usingenglish.com/quizzes/77.html

object pronouns

http://www.hseidensticker.de/unit0/obperpron.htm

object pronouns

http://www.inglesmundial.com/B15/grammar.htm

prepositions: in-on-at

http://www.english-4u.de/prep_of_place_ex3.htm

prepositions: in-on-at

http://www.esoeonline.org/main-index/index-exercises/grammarexs/elem/elemtimepreps2.htm

prepositions: in-on-at

http://www.esl-classroom.com/grammar/prep6.html

prepositions: in-on-at

http://www.esl-classroom.com/grammar/prep5.html

Prepositions

http://www.usingenglish.com/quizzes/399.html

prepositions

http://www.visualesl.com/pages/en/tests/90/prepositions

going to: future

http://saberingles.com.ar/curso/lesson11/05.html

going to: future

http://www.english-grammar-lessons.com/goingtofuture/exercise5.swf

going to: future

http://mrc.ltd.free.fr/Easy%20Beginner/Exercises/Intention.htm

going to: future

http://www.english-grammar-lessons.com/goingtofuture/exercise6.swf

going to: future

http://www.carmenlu.com/first/grammar/begoingto1_2.htm

going to: future

http://www.englishgrammarsecrets.com/presentformsforfuture/exercise3.swf

going to: future positive sentences

http://www.kico4u.de/english/uebungen/5klasse/going.htm

going to: future

http://members.iinet.net.au/~adelegc/grammar/going_to/going_to_quests.html

going to: future

http://www.oup.com/elt/global/products/englishfile/elementary/a_grammar/file07/grammar07_d02/

going to: future

http://www.autoenglish.org/going.htm

active to passive, present and past

http://www.englisch-hilfen.de/en/exercises/active_passive/passive_sentences1.htm

passive questions

http://esl.fis.edu/grammar/single/passive_r.htm

active to passive, present and past

http://www.english-4u.de/passive_ex1.htm

passive to active voice

http://www.saberingles.com.ar/curso/lesson24/07.html

if only/ i wish +past simple

http://english.baladre.org/sedaviwebfront/wish3.htm

conditional type 2

http://www.autoenglish.org/gr.con2.1.i.htm

conditional type 2

http://english.baladre.org/sedaviwebfront/conditionalbig12.htm

conditional type 2

http://www.redcamelot.com/camelot/exercises/SEPT26/Grammar/Conditional%20Sentences/Level%201.b.htm

conditional type 2

http://english.baladre.org/sedaviwebfront/conditionmatch1.htm

conditional type 2

http://www.ieslosremedios.org/~josefina/english_exercises/second_conditional.jcl.htm

conditional type 2

http://www.english-grammar-lessons.com/secondconditional/exercise4.swf

conditional type 2

http://www.englishgrammarsecrets.com/secondconditional/exercise1.swf

conditional type 1 and 2

http://www.ego4u.com/en/cram-up/grammar/conditional-sentences/exercises?03

conditional type 2

http://www.nspeak.com/newbasic/grammatica/ipoteticosecondo.htm

conditional type 2

http://www.english-grammar-lessons.com/secondconditional/exercise3.swf

conditional type 2

http://saberingles.com.ar/curso/lesson25/07.html

conditional type 2

http://www.oup.com/elt/global/products/headway/preintermediate/a_grammar/unit12/hwy_preint_unit12_1/

conditional type 2

http://saberingles.com.ar/curso/lesson25/06.html

conditional type 2

http://www.english-grammar-lessons.com/secondconditional/exercise2.swf

conditional type 2

http://www.english-grammar-lessons.com/secondconditional/exercise1.swf

conditional type 1

http://www.englishgrammarsecrets.com/type0/exercise4.swf

conditional type 1

http://www.ieslosremedios.org/~josefina/english_exercises/first_conditional.jcl.htm

conditional type 1

http://www.englishgrammarsecrets.com/firstconditional/exercise3.swf

conditional type 1

http://www.englishgrammarsecrets.com/firstconditional/exercise2.swf

conditional type 1

http://www.englishgrammarsecrets.com/firstconditional/exercise1.swf

conditional type 1

http://www.english-grammar-lessons.com/firstconditional/exercise5.swf

will/going to

http://www.englishpage.com/verbpage/verbs19.htm

going to/will

http://www.ice.urv.es/eoiact/level1/fernando/familytobe.htm

going to future

http://www.kico4u.de/english/uebungen/5klasse/goingto2.htm

going to future

http://www.englishgrammarsecrets.com/goingtofuture/exercise2.swf

reflexive pronouns

http://www2.arnes.si/~dkrape/reflexive.htm

reflexive pronouns

http://www.learnenglish.be/gr2_rpronoun_ex2.htm

http://www.ego4u.de/de/cram-up/grammar/pronouns/exercises?05

reflexive pronouns

http://www.learnenglish.be/gr2_rpronoun_ex1.htm

passive voice: present simple

http://www.ego4u.com/en/cram-up/grammar/passive/exercises

passive voice

http://users.fulladsl.be/spb9193/pass1.html

comparative or superlative

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-28995.php

going to

http://www.kico4u.de/english/uebungen/5klasse/goingto2.htm

comparatives

http://pagesperso-orange.fr/raud.dugal/beginners/comparison/exercise%202.htm

comparatives: as/than

http://eolf.univ-fcomte.fr/uploads/ressources/grammar/02_comparatives_superlatives/02b_compartives_superlatives/12.htm

Adjectives/Adverbs: comparatives

http://personales.com/espana/malaga/englishhere/paginas/hotpotatoeswebpages/paginas/FILLCOMPARATIVE1.htm

Past Simple/Present Perfect

http://www.better-english.com/grammar/pspp1.htm

Simple Past or Present Perfect

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_present_perfect.htm

since/for

http://www.englisch-hilfen.de/en/exercises/confusing_words/since_for.htm

Questions in present Perfect

http://www.englisch-hilfen.de/en/exercises/questions/present_perfect.htm

present perfect negative statements

http://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_negation.htm

Present Perfect

http://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_statements.htm

Past continuous and past Simple

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_progressive2.htm

Past simple and Past continuous

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_progressive.htm

Past continuous, questions

http://www.englisch-hilfen.de/en/exercises/tenses/past_progressive_mix2.htm

Past Continuous

http://www.englisch-hilfen.de/en/exercises/tenses/past_progressive_mix.htm

Simple past irregular verbs. negative sentences

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_negation_sentences3.htm

Simple past, irregular verbs, negative sentences

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_negation_sentences2.htm

simple past negative sentences

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_negation_sentences.htm

Simple past

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_statements2.htm

Past Simple

http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_statements.htm

Present simple or continuous

http://www.englisch-hilfen.de/en/complex_tests/simple_present_progressive1/index.php

Present Simple or continuous

http://www.tolearnenglish.com/exercises/exercise-english-1/exercise-english-879.php

Present Continuous

http://www.ego4u.com/en/cram-up/grammar/present-progressive/form/exercises?form02

Present Continuous

http://www.oup.com/elt/global/products/headway/beginner/a_grammar/grammarunit13/hwy_begin_unit13_2/

Present Continuous

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-6414.php

present continuous

http://www.pumpkinandcompany.com/PAC/Kids-activ-games_Gquiz_Prsntcont1-5e.htm

Present Simple possitive statements.

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-4950.php

Present Simple: negation of sentences

http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_negation_sentences.htm

Present Simple

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-9445.php

Present Simple

http://www.ego4u.com/en/cram-up/grammar/simple-present/form/exercises?03