The+Present+Perfect+Tense

1. The Present Perfect- unfinished time http://www.youtube.com/watch?v=Dkln8PfE1xE

2. Already and yet http://www.youtube.com/watch?v=u3RVtbj1opU

2. The Songs (in the Present Perfect) http://www.youtube.com/watch?v=GWSMgJGRs3E