I will work hard to make my dream come true. I hope your dream will come true one day. It takes sb. +时间+to do… Sb. spend（某种人称时态）+时间/钱+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… It's …years/days since sb. +ved It's great fun to do=sb. have great fun doing It's a pity that… It's an honor to… I'm/We're not allowed to … I'm afraid of making mistakes… There be …doing… Great changes have taken place in… sth is/are well worth v-ing. It seems/seemed that… It seems (im)possible to v… It is said that… As the saying goes, … …and …. are different in many ways. too + adj./adv. to do There are many differences between … and … I have made up my mind to … I am sure that… I am not sure whether/if… I would rather …. than … It doesn't matter if… Thank you for v-ing. If everyone can make a contribution to the earth/ nature/ society, our life will be better and better.