switch 4: FOR, SINCE, AGO

Here are some exercises for you to practise the grammar in unit 4.

COMPLETE WITH FOR, SINCE OR AGO

1. http://www.englishexercises.org/makeagame/viewgame.asp?id=9010
2. http://www.learn-english-today.com/lessons/lesson_contents/exercises/for-since-ago_quiz1.htm
3. http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-49804.php
4. http://www.ejerciciodeingles.com/ejercicios-present-perfect-for-since-ago-rellenar-huecos/
5. http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/upperf1.htm
6. http://www.english-grammar-lessons.com/presentperfectorpastsimple/exercise3.swf
7. http://www.englishmedialab.com/Quizzes/intermediate/since%20for%20last%20ago.htm
8. http://www.impact-english.com/members/Grammar_Practice/Always/test-grammar/gr_prac_S-F-gen.htm 

OTHER TYPES:

1. Correct or incorrect: http://www.english-grammar-lessons.com/presentperfect/exercise7.swf
2. Present perfect and For / since: http://www.bnv-bamberg.de/home/ulrich.koch/flg/englischinteraktiv/since-for-01.htm
3. Rewriting: http://sir.free.fr/forsince.htm
4. http://eolf.univ-fcomte.fr/uploads/ressources/grammar/14_time%20expressions/14gtanya_since_ago/tanya_since_ago.htm
5. FOR, SINCE, AGO AND JUST: http://www.vitutor.com/gramatica_inglesa/verb_tense/present_perfect_ej8.html
6. MATCHING: http://langues.u-bordeaux4.fr/ANGLAIS/EXOGRAM/forsinceago2.htm
7. Rewriting: http://nacho.montorio.info/2HSpresentperfectrewriting.htm