1. Have carved
->thì HTHT: S have/has VPII
2. Helped 
-> Hành động đã xảy ra và kết thúc trong quá khứ, chia thì QKĐ
3. Went
-> Hành động đã xảy ra và kết thúc trong quá khứ, chia thì QKĐ
4. Has done
-> thì HTHT: S have/has VPII for …
5. Has never eaten
-> thì HTHT: S have/has VPII
6. Have known
-> thì HTHT: S have/has VPII for…
7. Have you ever done - did
-> thì HTHT: Have/Has S VPII?
8. Have collected
-> thì HTHT: S have/has VPII 
9. Has made
-> thì HTHT: S have/has VPII

1My hobby is carving eggshells and now I ( carve ) _______have carved___ nearly 100.

thì HTHT

2Going home from school yesterday, I ( help ) _____helped___ an old man to go across the street.

thì QHĐ có từ  "yesterday"

3 Last Tuesday, I ( go ) ____went_______ home late because there was a traffic jams near my school.

thì QHĐ có từ "Last Tuesday"

4 At Tet, my mother and her close friends often go to the hospitals to donate cakes, sweets and toys for the sick children there. She (do)______has done___ it for many years.

5 Lan never ( eat ) __has never eaten________ Banh tet . She will try some this year .

6 Linh is my close friend. We ( know ) ____have known________ each other for 5 years.

7 Have You ever ( do ) _done_________ volunteer work ?

Yes. I ( do ) ___did______ volunteer work last month .

last month -> thì QKĐ

8 I ( collect ) ___have collected______ hundreds of old books and clothes for street children so far.

so far -> thì HTHT

9 Mi wants to raise funds for street children so the ( make ) ____makes____ hundreds of postcards to sell them.