Clip nay Captain Bear huong dan cac ban cach su dung thì  HIEN TAI TIEP DIEN (am/is/are + Ving), QUA KHU TIEP DIEN (was/were + Ving); TUONG LAI TIEP DIEN (will be + Ving). Chuc cac ban hoc tot nha. [Captain Bear giau bi kip o Da Lat, ban nao vo tinh nhat duoc thi  luyen xong, nho tra lai cho kho chu]