1.0Camdemy1.0https://eclass.uch.edu.tw<div>In this video, students learn two common uses of the present perfect tense. They also learn the difference between regular and irregular past participles. Fo...</div>https://eclass.uch.edu.tw/user/0https://eclass.uch.edu.tw/sysdata/doc/e/ea9663129a13ee07/f42c_l.jpg360640<iframe class="embedly-embed" src="//cdn.embedly.com/widgets/media.html?src=https%3A%2F%2Fwww.youtube.com%2Fembed%2F553eeL1Dvho%3Fautohide%3D1&display_name=YouTube&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D553eeL1Dvho&image=http%3A%2F%2Fi.ytimg.com%2Fvi%2F553eeL1Dvho%2Fhqdefault.jpg&key=705fe00b29ca4031aeda8362645d2624&type=text%2Fhtml&schema=youtube" width="640" height="360" scrolling="no" title="YouTube embed" frameborder="0" allow="autoplay; fullscreen" allowfullscreen="true"></iframe>video64036005:56001embedyoutubehttps://eclass.uch.edu.tw/sysdata/doc/e/ea9663129a13ee07/f42c.jpghttps://eclass.uch.edu.tw/sysdata/doc/e/ea9663129a13ee07/f42c.jpghttps://eclass.uch.edu.tw/sysdata/doc/e/ea9663129a13ee07/video/thumbs/storyboard.jpghttps://www.youtube.com/watch?v=553eeL1Dvhohttps://eclass.uch.edu.tw/sysdata/doc/e/ea9663129a13ee071