I think you guys need to have more practice with the present perfect simple and continuous. Here are some links for a few online exercises:
Past Simple vs. Present Perfect
http://www.englishpage.com/verbpage/verbs5.htm
Present Perfect Simple
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple
Present Perfect Simple vs. Continuous
http://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro
16 years ago
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