Ta có cấu trúc thì HTHT 

S + have / has + VPII 

- khi HTHT kết hợp since :

-> S + have / has + VPII  + Since + Mốc thời gian và còn vế đằng sau thì + thì QKĐ 

- Khi HTHT kết hợp for 

-> S + have / has + VPII  +  For + 1 khoảng thời gian 

Bài làm 

1 we haven't  seen her since Christmas day

2 This is the first time I have   eaten this kind of food ( ở đây thêm chứ ever cũng đc ) 

3 It has been raining for an hour

-> It;s has been + v -ing + for + 1 khoảng thời gian 

4 the last time we visited my grandparents was two months ago

5  I began to study English three years ago

6 It's nearly five years since my brother last saw his best friend

*Công thức chung:

-Thì Hiện Tại Hoàn Thành:S+Has/Have+Vpp+O

-This is the first time+S+Has/Have+Vpp

-The last time+S+V(ed/2)

-Begin+to V(bare)

-Since+Thì Qúa Khứ Đơn

1.We haven't seen her since Christmas Day.

2.This is the first time I have eaten this kind of food.

3.It has rained for an hour.

4.The last time we visited my grandfather was two months ago.

5.I began to study E three years ago.

6.It's nearly five years since my brother saw his best friend.

@TriLeCongTri

chúc em học tốt!!!!!!!