It takes sb. time to do ... OR It takes time for sb. to do ... (the use of the anticipatory it: 用作先行词的it) e.g. It didn’t take them long to understand that we had to use less water. (Para. 8) It took two and a half months for us to have the job done. 1 half an hour, my parents, back to the hotel, finally find their way 2 this difficult math problem, almost two hours, work out, we 3 we, will, more than three months, this art project, accomplish