Sb. spend(某種人稱時(shí)態(tài))+時(shí)間/錢+on sth./ (in) doing sth.

　　It's important/necessary/useful/useless/common…(for sb.) to v…

　　It's nice/kind of sb. to v..

　　It's time for sb. to do sth.

　　It's a waste of time to…

　　I will work hard to make my dream come true.

　　I hope your dream will come true one day.

　　It takes sb. +時(shí)間+to do…

　　It's …years/days since sb. +ved

　　It's great fun to do=sb. have great fun doing

　　It's a pity that…