十七、There is no one but ~~~(没有人不……) 例句：There is no one but longs to go to college. 没有人不渴望上大学。 十八、be forced/compelled/obliged to V(不得不……) 例句：Since the examination is around the corner，I am compelled to give up doing sports. 既然考试迫在眉睫，我不得不放弃做运动。 十九、It is conceivable that 句子(可想而知的) It is obvious that 句子(明显的) It is apparent that 句子(显然的) 例句：It is conceivable that knowledge plays an important role in our life. 可想而知，知识在我们的一生中扮演一个重要的角色。 二十、That is the reason why ~~~(那就是……的原因) 例句：Summer is sultry. That is the reason why I don‘t like it. 夏天很燠热。那就是我不喜欢它的原因。 二十一、For the past 时间，S 现在完成式……(过去……年来，……一直……) 例句：For the past two years，I have been busy preparing for the examination. 过去两年来，我一直忙着准备考试。 二十二、Since S 过去式，S 现在完成式。 例句：Since he went to senior high school，he has worked very hard. 自从他上高中，他一直很用功。 二十三、It pays to V ~~~(……是值得的。) 例句：It pays to help others. 帮助别人是值得的。 二十四、be based on(以……为基础) 例句：The progress of thee society is based on harmony. 社会的进步是以和谐为基础的。 二十五、Spare no effort to V(不遗余力的) We should spare no effort to beautify our environment. 我们应该不遗余力的美化我们的环境。