This document provides answers to exercises on using the past simple tense versus the present perfect tense in English. It includes multiple choice questions with answers in sections I through V. Additional reference links on the past continuous tense are included at the end. The document appears to be teaching materials from an English learning website focused on practical English.

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2. Đáp án quá khứ đơn vs hiện tại hoàn thành (1)
I.
1. lived/went 5. have caught
2. Did you 6. did you go
wear/insisted/left/cut/has 7. has waited
worn 8. has just begun
3. has written/has just 9. began/ lasted/ enjoyed
finished 10. have missed
4. has played 11. has been
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3. Đáp án quá khứ đơn vs hiện tại hoàn thành (2)
12. Have you ever been/spent/Did you have/stopped
13. have not smoked
14. has not seen
15. have not finished
16. have just cleaned
17. did/was
18. Did you see
19. have not seen/told
20. have lost/have you seen/did you last wear/wore/left
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4. Đáp án quá khứ đơn vs hiện tại hoàn thành (3)
II.
1.were 6. lived
2.have always shared 7. moved
3.have always shared 8. have visited
4.have also enjoyed 9. has just bought
5.have spent 10. have not seen
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5. Đáp án quá khứ đơn vs hiện tại hoàn thành (4)
III.
Have been, left, have you done, have done, have mended,
have built, have had, have gone, , spoke, happened, fell
down, have not finished, had, drove, did not crash, has been
IV.
1. saw/have already seen
2. has worked/started
3. Have you ever met/saw/met
4. left/caught/realized/were/ have happened/did you
do/called
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6. Đáp án quá khứ đơn vs hiện tại hoàn thành (5)
IV.
5. have already made/have just swept/have not started/did
6. Did you begin/have recently completed/asked
7. have just passed
8. Have you always had/was
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7. Đáp án quá khứ đơn vs hiện tại hoàn thành (6)
V.
1. Is 8. Feel
2. Am writing 9. Have given
3. Have left 10. Have advertised
4. Am studying 11. Hope
5. Is 12. Have enclosed
6. Speak 13. Think
7. Have taken 14. Am looking
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8. Other- reference
 http://www.englishpage.com/verbpage/pastcontinuous.html
 http://www.ego4u.com/en/cram-up/grammar/past-progressive
 http://www.englishtenseswithcartoons.com/tenses/past_continuous
 http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/pascon.htm
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9. www.themegallery.com