Ex 3: Chia động từ thì hiện tại hoàn thành  * Thể khảng định 1.        We (buy)…………………………a new light. 2.        He (write)……………………….five letters. 3.        John (be) ………………………to Paris, London and New York. 4.        The family (be)………………… to the beaches in Nha Trang many times. 5.        Tom (visit)……………………. London twice. 6.        His brother (be)………………..to Ho Chi Minh city. 7.        There is no more cheese. I (eat)……………. ……….it all, I’m afraid. 8.        The bill isn’t right. They (make)……………………….. a mistake. 9.        Don’t you want to see this programme. It ………………………..(start). 10.    It’ll soon get warm in here. I (turn)……………………………. the heating on.