句子·剖析·拓展 Today,however,everyone needs to learn new things constantly on the job and it is common practice for people to go back to school from time to time in order to keep up with the fast changing world
然而,如今每一个人都需要不断地学习与工作相关联的新鲜事物,并且为了跟上这飞速发展的世界人们间或再次返回学校是最普通的惯例
【剖析】 1)此句是由关联词 and 连接的并列句
2)在第二个分句中,it 是形式主语,真正的主语是 go back to school
此句可以转换成:Going back to school is common practice for people
3)第二个分句中还包含两个带 to 的不定式:to go back to school 和 to keep up with
且 in order to
作此句的目的状语
【拓展】 it 作形式主语的用法:为了避免将句中作真实主语的不定式短语、ing 形式短语和主语从句置于句首造成头重脚轻,习惯上用 it 作形式主语来指代后面的真实主语
1)代替不定式短语It is dangerous to swim in the lake
在这湖里游泳是危险的
2)代替ing 形式It is nice talking to you
和你谈话真愉快
3)代替主语从句It is certain that we shall succeed
我们一定会成功
All you need to do is develop learning skills and learn how to