giuppp tui voii mang oiii D. Give the correct forms of verbs in brackets. 1. Their family decided (go) on holiday in Nha Trang this winter. 2. It's difficult (understand) how to operate this machine. 3. My younger brother enjoys (fix) the broken things when he has free time. 4. She seems to avoid (meet) people so no one can contact her. 5. Your teacher will not allow you (use) mobile phones during the examination. E. Give the correct forms of verbs in brackets, using past simple or present perfect. 6. I heard your car (break) down again yesterday. - Yes, it (happen) three times. 7. It (rain) every day since they (arrive) here. 8. She never (be) to Korea. You ever (visit) Korea? 9. He (tell) me his name, but I (forget) it. 10. Jack (not meet) his grandparents for a long time.

D. Give the correct forms of verbs in brackets.

${1.}$ Their family decided to go on holiday in Nha Trang this winter.

${-}$ decided + to V

${2.}$ It's difficult to understand how to operate this machine.

${-}$ It's difficult + to V

${3.}$ My younger brother enjoys fixing the broken things when he has free time.

${-}$ enjoy + V-ing

${4.}$She seems to avoid meeting people so no one can contact her.

${-}$ avoid + V-ing

${5.}$Your teacher will not allow you to use mobile phones during the examination.

${-}$ allow sb + to V

E. Give the correct forms of verbs in brackets, using past simple or present perfect.

${6.}$I heard your car broke down again yesterday. - Yes, it has happened three times.

${7.}$It has rained every day since they arrived here.

${8.}$She has never been to Korea. Have you ever visited Korea?

${9.}$He told me his name, but I have forgotten it.

${10.}$Jack has not met his grandparents for a long time.

${--------------------}$

Thì HTHT:

${+)}$ S + have/has + V3 + O

${-)}$ S + have/has + not + V3 + O

${?)}$ Have/Has + S + V3 + O?

Thì QKĐ:

${+)}$ S + V2 + O

${-)}$ S + did + not + V-inf + O

${?)}$ Did + S + V-inf + O?

`1` to go

`-` S + decide + to V: quyết định làm gì

`2` to understand

`-` It's + adj + to V

`3` fixing

`-` S + enjoy + V-ing: thích làm gì

`4` meeting

`-` S + avoid + V-ing: tránh làm gì

`5` to use

`-` S + allow + O + to V: cho phép ai làm gì

`6` broke `-` has happened

`-` QKĐ, dấu hiệu: yesterday

`-` HTHT, dấu hiệu: three times

`7` has rained `-` arrived

`-` HTHT since QKĐ

`->` HTHT: S + have/has + Vp2

`->` QKĐ: S + V-ed/c2

`8` has never been `-` Have you ever visited

`-` HTHT, dấu hiệu: ever

`+)` S + have/has + Vp2

`?)` (Wh) + Have/Has + S + Vp2?

`9` told `-` have forgot

`-` QKĐ: S + V-ed/c2

`-` HTHT: S + have/has + Vp2 

`10` hasn't met

`-` HTHT, dấu hiệu: for a long time

`->` S + have/has + not + Vp2