giúp em câu 16 đến 23.với ạ

17. While Fred was painting a wall, he fell off the ladder - Chuyển trạng ngữ thời gian với "while" -> mệnh đề

18. They came home after finishing typing the report

- S + V1 + then + + V2

-> S + V2 + after + S + have/has  + (V1->PII) hoặc rút gọn đi thành after + Ving 

19. Lan and Minh began playing the guitar 5 years ago - S + have/has + PII + for + khoảng thời gian <-> S + started/began + Ving + khoảng thời gian + ago

20. After making an appointment, Alice went to see the doctor - Tương tự câu 18 nhưng then -> and

21. She has never eaten Sushi before 

- This/It is the first time + S +have/has + (ever) + PII <-> S + have/has + never/not + PII + before

22. I have never gone to a ballet before

23. We have never had a long trip together