Ejercicios online para repasar

Present Perfect
http://www.englishexercises.org/makeagame/viewgame.asp?id=3365#a
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-18223.php
http://www.englishpage.com/verbpage/verbs5.htm
http://www.englishpage.com/verbpage/verbs6.htm

Future
http://www.englishexercises.org/makeagame/viewgame.asp?id=3135
http://www.englishpage.com/verbpage/verbs18.htm
http://www.englishpage.com/verbpage/verbs19.htm

Modals
http://www.englishexercises.org/makeagame/viewgame.asp?id=1487
http://www.englishexercises.org/makeagame/viewgame.asp?id=7521


Prepositions
http://www.englishpage.com/prepositions/time_prepositions_1.htm
http://www.englishpage.com/prepositions/location_prepositions_1.htm

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Present Perfect

Aquí podéis ver la explicación. http://www.englishpage.com/verbpage/presentperfect.html

Ejercicios aquí
http://www.englishpage.com/verbpage/verbs5.htm
http://www.englishpage.com/verbpage/verbs6.htm