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十七、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。 十八、be based on 例句：The progress of the society is based on harmony. 社会的进步是以和谐为基础的。 十九、be closely related to ~~ 例句：Taking exercise is closely related to health. 做运动与健康息息相关。 二十、Get into the habit of + Ving = make it a rule to + V 例句：We should get into the habit of keeping good hours. 我们应该养成早睡早起的习惯。 二十一、What a + Adj + N + S + V! = How + Adj + a + N + V! 例句：What an important thing it is to keep our promise! How important a thing it is to keep our promise! 遵守诺言是多么重要的事! 二十二、Leave much to be desired 例句：The condition of our traffic leaves much to be desired. | 
