1, Has - tried

* ever: dấu hiệu thì HTHT

2, Did - go

* last week: dấu hiệu thì QKD

3, have - been

* never: dấu hiệu thì HTHT

4, have travelled

* so far: dấu hiệu thì HTHT

5, have been

* since: dấu hiệu thì HTHT

6, Have - finished

* yet: dấu hiệu thì HTHT

7, came - told

* last night: dấu hiệu thì QKD

8, have visited - went - was - haven't visited

* so far: dấu hiệu thì HTHT

* last summer: dấu hiệu thì QKD

* ago: dấu hiệu thì QKD

* yet: dấu hiệu thì HTHT

9, did - come

10, came

11, Did - watch

* yesterday: dấu hiệu thì QKD

12, have - left

* already: dấu hiệu thì HTHT

13, have - known

14, met - have known

* Có thời gian cụ thể nên chia QKD

* for + khoảng thời gian: dấu hiệu thì HTHT

15, happened

* last night: dấu hiệu thì QKD

16, Did - read

* QKD + when + QKD

1.have;tried

2.Did;go

3.have;been

4.have travelled

5.have been

6.have ;finished

7.came;told

8.have visited;went;went;haven't visited

9.did;came

10.came

11.Did;watched

12.have;leaved

13.have;known

14.met;have known

15.was happened

16.Did;read