@article{oai:tsukuba.repo.nii.ac.jp:00007186,
 author = {Wada, Naoaki},
 journal = {Tsukuba English Studies},
 month = {Aug},
 pages = {179--215},
 title = {On the English present perfect : a cognition-based approach to the categorization of its functions},
 volume = {13},
 year = {1994}
}