27. We started cooking the meal when he came.
28. This is the 1st time she has ever seen Mount Everest.
29. This is the 1st time they have ever gone to France.
30. Mary started working in this school a few months ago.
31. Mrs Lien hasn't visited Canada before.
32. studied ( quá khứ vì có trạng từ yesterday: hôm qua)
33. have studied ( HT hoàn thành vì có trạng từ so far: cho đến nay)
34. watched ( quá khứ vì có trạng từ last night: đêm qua)
*Công thức :
1. S+have/has+V3/ed+.....
= S+ started/begin+Ving/toV+...
2. S+have/has+not/never+V3ed.....+before
= This is the 1st time+S+have/has+(ever)+V3ed+....
$\text{STUDY WELL!}$