Đáp án:

1. I have collected coins when I was a little boy.

=> have collected->collected

2. I see a real elephant when I went to Ban Don last year.

=> see->saw

3. We clean the beach last Sunday.

=> clean->cleaned

4. I didn't see her for two weeks.

=> didn't see->haven't seen

5. Do you do your homework yet ?

=> do you do-> have you done

*Giải thích:

Câu 1,2,3: S + V-ed+....

Câu 4,5: S + have/ has not + V3/V-ed

Have/ has + S + V3/V-ed?

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#cày ít

11 have collected -> collected

-> thì QKĐ dạng khẳng định : S + v-ed / V2

-> dấu hiệu nhận bt : when i was a little boy

12 see -> saw

-> thì QKĐ dạng khẳng định : S + v-ed / V2

-> dấu hiệu nhận bt : last year

13 clean -> cleaned

-> thì QKĐ dạng khẳng định : S + v-ed / V2

-> dấu hiệu nhận bt : last sunday

14 didn't see -> haven't seen

-> thì HTHT + for : S + have / has + VPII + for + 1 khoảng thời gian

-> dấu hiệu nhận bt : for two weeks

15 do you do -> have you done

-> thì HTHT + yet dạng nghi vấn : have / has + S + VPII + yet 

-> dấu hiệu nhận bt : yet