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.
