Simple Past, Present Perfect and Present Perfect Continuous

Here are some exercises on simple past, present perfect and present perfect continuous:

http://www.englishpage.com/verbpage/verbs5.htm

http://www.englishpage.com/verbpage/verbs6.htm

http://www.englishpage.com/verbpage/verbs7.htm

http://www.englishpage.com/verbpage/verbs8.htm