If yu want to put into practise your English go to these web pages
.http://www.englisch-hilfen.de/en/exercises_list/alle_grammar.htm
isabelperez.com
http://learnenglish.britishcouncil.org/en/word-games`
PRESENT PERFECT or SIMPLE PAST?, by Carlos Reis
Find this and other verb tenses exercises in English Exercises .org
