Part 1: 雙越比較的語法概念

The 比較級 ... + the 比較級 ... ：越...越...

The sooner, the better.

The cheaper, the better.

The more you eat it, the better you will like it. 

= if you eat it more, you will like it better. (副詞比較級 more 修飾 eat, better 修飾 like)

The hotter the water is, the more enjoyable it will be. 

= if the water is hotter, it will be more enjoyable. 

雙“越”比較的主要時態(tài)：主將從現(xiàn)

The harder you work, the greater progress you will make.

The higher the unemployment rate is, the more people like you and me will suffer.

不排除：The more he gets, the more he wants. 

Or: The harder he tried not to think about her, the more he missed her.

Part 2：比較：雙“越”比較在雅思議論文中的加分用法

Example 1: When more machinery is used in modern industry, more workers will get unemployed and the quality of products will get lower.

7分變身： The more machinery is used in modern industry, the more workers will get unemployed and the lower the quality of products will get.

Example 2: 大學招收越多的學生的時候，每個學生所得到的來自教師的關注就會變少同時教學品質(zhì)也就因此變得更差了。

7分亮句：Some parents believe the more students a university accepts, the less attention every student will get from their professors and thus the worse the quality of tertiary education will become.

Example 3: Environmental Protection

一個城市的私家汽車擁有量和使用率更高的時候，它的空氣污染就會變得對人們的健康更加有威脅。

7分神句：The more private cars people own in a city and the more frequently these car owners drive their cars to travel, the more serious the air pollution in this city will become to threaten the physical well-being of all its residents.