Cấu trúc: S +have/has + not + V3/Ved + O + before = It is/this is + the first time + S + have/has + V3/Ved +O 1. Sam has not been there before => 2.That tutor hasn't taughet me before => 3. It's the first time I have had an appointments with a doctor. => 4. This is the first time he has had a runny nose. => 5.It's the first time she has worked in that community. => 6.My brothers have not lived here before. => 7.Sue and Tom haven't in hospitals before. => 8.The men haven't come to my flat before. => 9. It's the first time John and Tom have done volunteer work. =>

`1` This is the first time Sam has been there .

`2` This is the first time that tutor has taught me .

`3` I have not had an appointment with a doctor before .

`4` He has not had a runny nose before .

`5` She has not worked in that community .

`6` This is the first time my brothers have lived here .

`7` This is the first time Sue and Tom have been in hospitals .

`8` This is the first time the men have come to my flat .

`9` John and Tom have not done volunteer work before .

`-` Cấu trúc chuyển đôi về lần đầu ai đó làm gì ... :

`<=>` This/It + is the first time + S + have/has + V3/V_ed + O ...

`<=>` S + have/has + not + V3/V_ed + O + before .

`@` Thì Quá Khứ Đơn -> Hiện Tại Hoàn Thành:

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

= S + has/have + never + Vpp + O + before

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

`1,` This is the first time Sam has been there.

`2,` This is the first time that tutor has taught me.

`3,` I have not had an appointments with a doctor before.

`4,` He hasn't had a runny nose before.

`5,` She hasn't worked in that community before.

`6,` This is the first time my brothers have lived here.

`7,` This is the first time Sue and Tom have been in hospitals.

`8,` This is the first time the men have come to my flat.

`9,` John and Tom haven't done volunteer work before.