~にしたがって・~につれて (change)
One gradual change develops along with another
You’ll be able to connect two gradual developments that change together and distinguish this use of にしたがって from following an instruction.

山道を登るにしたがって、だんだん空気が涼しくなりました。
yamamichi o noboru ni shitagatte, dandan kuuki ga suzushiku narimashita.
What do you think this sentence means?
As we climbed the mountain road, the air gradually became cool.
Two changes develop together
~にしたがって and ~につれて mean “as” or “with.” They show that one gradual change develops along with another.
暗くなるにつれて、気温が下がってきました。
kuraku naru ni tsurete, kion ga sagatte kimashita.
As it got dark, the temperature dropped.
子どもが大きくなるにつれて、家を狭く感じるようになりました。
kodomo ga ookiku naru ni tsurete, ie o semaku kanjiru you ni narimashita.
As the children grew, the house started to feel small.
Put the first changing condition first
Use dictionary-form verb or noun + にしたがって/につれて, followed by a second change. This use describes linked developments, not obeying a rule.
年を取るにつれて、体力が落ちてきた。
toshi o toru ni tsurete, tairyoku ga ochite kita.
As I have gotten older, my physical strength has declined.
にしたがって (following) vs にしたがって (change)
After a rule or instruction, にしたがって means you follow it. After something that changes, it means a second change comes along with the first.
rule / instruction + にしたがって, following
ルールにしたがって、ゲームを進めました。
ruuru ni shitagatte, geemu o susumemashita.
We played the game following the rules.
The rules are something we obeyed.
change + にしたがって, as … changes
ゲームが進むにしたがって、ルールがわかってきました。
geemu ga susumu ni shitagatte, ruuru ga wakatte kimashita.
As the game went on, I came to understand the rules.
Two changes develop together.
台風が近づくにつれて、風がだんだん強くなってきた。
taifuu ga chikazuku ni tsurete, kaze ga dandan tsuyoku natte kita.
As the typhoon approached, the wind gradually grew stronger.
駅から離れるにしたがって、家賃が安くなる。
eki kara hanareru ni shitagatte, yachin ga yasuku naru.
The farther you get from the station, the cheaper the rent becomes.
練習を重ねるにつれて、ピアノを弾くのが楽しくなってきた。
renshuu o kasaneru ni tsurete, piano o hiku no ga tanoshiku natte kita.
As I kept practicing, playing the piano became more and more fun.
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