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。