1）比较的成分要对等。

　　【例如】

　　He is more concerned about others than about himself. My father is in better health now than last year. The population of China is larger than that of America.

　　2）the +比较级……，the +比较级……意为“越……，越……”。前面部分是从句，后面部分是主句。

　　【例如】

　　The harder you work, the more successful you will be. The earlier you come, the better place you can find.