It took me half an hour to write that letter. (SPENT) →

Tạm dịch: Tôi đã dành nửa giờ để viết bức thư đó.
Ta có cấu trúc:
It + take+ sb + time + to V
= S + spend + time + V-ing
= Mất bao lâu cho ai để làm gì
=> Đáp án: I spent half an hour writing that letter.

It took me half an hour to write that letter. (SPENT) → _______________________________________________________

It took me half an hour to write that letter. (SPENT)
→ _______________________________________________________