ばほど
(Ba hodo)
Expresses that 'the more' one thing happens, 'the more' another thing changes accordingly.
Connection rules
- +Verb (ば-form) + Verb (Dictionary Form) + ほど
- +i-Adjective (ければ) + i-Adjective (Basic) + ほど
- +na-Adjective (なら) + na-Adjective (な) + ほど
Examples
1.
日本語は勉強すればするほど難しくなります。

Nihongo ha benkyou sure ba suru hodo muzukashiku nari masu.
The more you study Japanese, the more difficult it becomes.
「Talking about language learning」
2.
部屋は広ければ広いほど家賃が高くなります。

Heya ha hirokere ba hiroi hodo yachin ga takaku nari masu.
The wider the room is, the more expensive the rent becomes.
「Hunting for an apartment」
Practice
The more I read this book, the more I realize how deep it is.
この本は___、その内容の深さがわかります。
Romaji also accepted