につれて
Usage
Xにつれて indicates that something takes place as X occurs. X can be either a verb or the steam of a する-verb "as -; with -"
Examples
暖かくなるにつれて、雪が溶け、木が緑になっていく。
As it gets warmer, the snow melts, and the trees start turning green.
日本語が上手になるにつれて、日本人と話すのが恥ずかしくなくなってきた。
As I've become more proficient in Japanese, speaking with Japanese people has become less embarrassing.