các bạn giải hộ mình vs ạ

`Đáp` `án:`

1.

a. I spend an hour preparing to teach a lesson.

b. He spends two days finishing ploughing his plot of land.

c. It takes Mrs. Tuyet 30 minutes to come home.

2.

a. I have never seen that man before.

b. She has never cooked dinner before.

c. The students have never used cellphones in lessons before.

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It takes + O + time + to V: mất bao nhiêu thời gian làm gì 

= S + spend(s) + time + Ving: dành bao nhiêu thời gian làm gì 

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S + has/have + not/never + V3/ed + ... before

→ This/It is the first time + S+ has/have+ V3/ed