past simple

gammar
http://www.curso-ingles.com/gramatica-inglesa/pasado.php

www.curso-ingles.com/gramatica-inglesa/pasado.php

exercises
http://www.myenglishpages.com/site_php_files/grammar-exercise-simple-past.php#.Uzp3LaKLUuA
http://www.ego4u.com/en/cram-up/grammar/simple-past

present and past perfect

http://www.englishpage.com/verbpage/verbs12.htm
http://www.englishpage.com/verbpage/presentperfect.html
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-10277.php
http://www.curso-ingles.com/ejercicios-test-ingles/present-perfect-past-simple.php

present and past continious

http://www.englishexercises.org/makeagame/viewgame.asp?id=2935
http://www.englishpage.com/verbpage/pastcontinuous.html
http://www.leshoekje.be/leshoekje/ICT-oef%20ENG2/present-past3.htm
http://www.englisch-hilfen.de/en/grammar/past_progressive_verbs.htm

should, must, have to

grammar
http://www.aulafacil.com/Ingejerc/Lecciones/Lecc26.htm
exercises
http://www.aulafacil.com/Ingejerc/Lecciones/Ejerc26.htm

http://www.englishexercises.org/makeagame/viewgame.asp?id=6270

http://www.englishexercises.org/makeagame/viewgame.asp?id=3401

prepositions: at, in, on

1. I usually go out weekends.
2. London is very cold winter but warm summer.
3. My sister works the hospital.
4. I will travel to New York June.
5. What are you doing Friday?
6. John and Mary got married 1989.

MORE EXERCISES:
http://www.saberingles.com.ar/exercises/indexm.html

opposite adjectives

1. cheap 
2. happy
3. new
4. fast
5. weak




a. old
b. slow
c. strong
d. expensive
e. sad

1. far
2. clean 
3. hot
4. early
5. thick




a. cold
b. thin
c. near
d. late
e. dirty

songs

http://www.saberingles.com.ar/songs/exercises/index1.html