Đáp án + Giải thích các bước giải:

`1.` I saw/ have seen that film already

`2.` We went / have gone to the movies three times last month

`3.` Did you ever do/ Have you ever done volunteer work?

`4.` I had/ have had five tests so far this semester

`5.` Linus did/ has done his homework before he went to sleep

`6.` This is my grandparent' house. They lived/have lived here for more than 50 years

`7.` She bought/ has bought a new moblie phone two days ago

`8.` Did you see/ have you seen Peter at the party last night?

`9.` I read/have read this book twice and I still find it very interesting

`10.` They didn't play/haven't played very well yesterday. They lost the match

`--------------`

Câu `1; 3; 4; 5; 6; 9`: Chia theo thì Hiện tại hoàn thành (Dấu hiệu: Phần gạch chân)

`(+)` S + have/has + PII

`(-)` S + have/has + not + PII

`(?)` Have/ Has + S + PII?

`-` I/ we/ you/ they và danh từ số nhiều - have `|` She/ he/ it và danh từ số ít - has

Câu `2; 7;8;10`: Chia theo thì Quá khứ đơn (Dấu hiệu: Phần gạch chân)

Dạng tobe: I/ she/ he/ it và danh từ số ít - was `|` You/ we/ they và danh từ số nhiều - were

`(+)` S + was/ were + ......

`(-)` S + was/ were + not + .....

`(?)` Was/ Were +S + ...?

Dạng động từ thường:

`(+)` S + Ved/ V2

`(-)` S + didn't + V

`(?)` Did + S + V?