Present Perfect Simple-Present Perfect Continuous

Use the following links to practise Present Perfect Simple-Present Perfect Continuous:


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


http://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises


http://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/exercises?ex04


http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/upperf1.htm