`color{aqua}{\text{_ThuyLinh}}`

19, He hasn't gone abroad before.

- This is the first time + S + has/have + Vpp + O

= S + has/have + not + Vpp + O + before

20, She has been driving for one month.

- S + started/began + V-ing/to V + O + time

= S + has/have + Vpp + O + for/since

21, We have been eating since it started to rain.

- S + started/began + V-ing/to V + O + time

= S + has/have + Vpp + O + for/since

22, I haven't had my hair cut since I left her.

- S + last + Ved/V2 + O + when/in/on/at/... : Ai đó lần cuối làm gì

= S + has/have + not + Vpp + O + for/since + ...

23, She hasn't kissed me for five months.

- The last time + S + Ved/V2 + was + time : Lần cuối cùng ai đó làm gì

= S + last + Ved/V2 + time : Ai đó lần cuối làm việc gì 

-> S + has/have + not + Vpp + for/since + time

- time + ago -> for + time (for + khoảng thời gian)

24, We haven't met for a long time.

- It's + since + S + (last) + Ved/V2 + O

= S + has/have + not + Vpp + for/since...

25, How long have you had it?

- When + did + S + (last) + Ved/V2 + O?

= How long is it since + S + Ved/V2 + O?

19 She hasn't gone abroad before.

- S + have/has + not + V3/ed + before: Chưa từng làm gì trước kia.

20 She has driven for a month.

- S + have/has + V3/ed + for + khoảng thời gian: Đã làm gì trong bao lâu.

21 We have eaten since it started to rain.

- S + have/has + V3/ed + since + S + V2/ed: Đã làm gì từ khi nào.

22 I haven't had my hair cut since I left her.

- S + have/has + not + V3/ed + since + S + V2/ed: Đã không làm gì kể từ khi nào.

23 She hasn't kissed me for 5 months.

24 We haven't met for a long time.

- S + have/has + not + V3/ed + for + khoảng thời gian: Chưa làm gì trong bao lâu.

25 How long have you had your own house?

- How long + have/has + S + V3/ed?: Đã làm gì được bao lâu?