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。
        
        　　二十六、bring home to + 人 + 事 （让...明白...事）
        　　例句：We should bring home to people the value of working hard.
        　　我们应该让人们明白努力的价值。
        
        　　二十七、be closely related to ~~ （与...息息相关）
        　　例句：Taking exercise is closely related to health.
        　　做运动与健康息息相关。
        
        　　二十八、Get into the habit of + Ving
        　　= make it a rule to + V （养成...的习惯）
        　　We should get into the habit of keeping good hours.
        　　我们应该养成早睡早起的习惯。