INTERMEDIO 2 GRAMMAR: PAST TENSES

hi guys,

if you feel you need to further study the past perfect and past perfect continuous, here are some links with explanation and grammar:

http://www.perfectyourenglish.com/grammar/past-perfect-tense.htm

http://www.perfectyourenglish.com/grammar/past-perfect-progressive-tense.htm

and here is a quiz on past tenses :

http://esl.about.com/library/quiz/blgrquiz_pastforms.htm