(Present perfect tense) 16) Charity (break) ____________________ her leg on the ski slope. Please dial 911. 17) The city (allow) ______________ residents to shoot off fireworks each year on the Fourth of July. 18) The lake (freeze) _____________________ solid. Now we can go skating. 19) The sun (rise) ______________________. Its time to get up. 20) The army (battle) ________ the enemy for two weeks. The soldiers are exhausted. 21) The principal (introduce) _______________ the new teacher. She seems very nice. 22) Using his telescope, Jeremy (see) ____________________ other galaxies. He writes them on his blog. 23) The judge (listen) ____________ to all of the evidence. Now he will make a ruling. 24) The strawberries (spoil) _________. They should have been kept in the refrigerator 25) The doctor (write) _________________ a book about disease prevention. It will be published soon

$16.$ has broken

- break $-$ broke $-$ broken (v.): vỡ, gãy.

$17.$ has allowed

- allow $-$ allowed $-$ allowed (v.): cho phép.

$18.$ has frozen

- freeze $-$ froze $-$ frozen (v.): đóng băng.

$19.$ has risen

- rise $-$ rose $-$ risen (v.): mọc.

$20.$ has battled

- battle $-$ battled $-$ battled (v.): đánh nhau.

$21.$ has introduced

- introduce $-$ introduced $-$ introduced (v.): giới thiệu.

$22.$ has seen

- see $-$ saw $-$ seen (v.): nhìn thấy.

$23.$ has listened

- listen $-$ listened $-$ listened (v.): lắng nghe.

$24.$ has spoiled

- spoil $-$ spoiled $-$ spoiled (v.): bị hỏng.

$25.$ has written

- write $-$ wrote $-$ written (v.): viết.

$==="$

$*$ Thì hiện tại hoàn thành:

$(+)$ S + has (He, She, It,  Danh từ số ít) $/$ have (I, We, You, They, Danh từ số nhiều) + V (Pii).

$(-)$ S + has (He, She, It,  Danh từ số ít) $/$ have (I, We, You, They, Danh từ số nhiều) + not + V (Pii).

$(?)$ Has (He, She, It,  Danh từ số ít) $/$ Have (I, We, You, They, Danh từ số nhiều) + S + V (Pii) + ?