Since that day, I understand white can be dirty moreier. Since that day, I understand white can be dirtier.

Since that day, I understand whitemore that snow can be dirty more. Since that day, I understand more that snow can be dirty.

When I was kid, iI always tried to wonderinged how the snow can be. When I was kid, I always wondered how the snow can be.

Can be what?😁

When I was kid, i always tried to wonderingimagine how the snow can bewould look. When I was kid, i always tried to imagine how snow would look.

In some movies, the snow always looked perfect; the perfect white color, the cold weather and everything. In some movies, the snow always looked perfect; the perfect white color, the cold weather and everything.

In some movies, the snow always looks perfect; the with a perfect white color, the cold weather and everything. In some movies, the snow always looks perfect with a perfect white color.

You wouldn't normally list "the cold weather" here, as you're describing how the snow looks, and the weather is a bit more abstract than that.

When I saw the snow the first time, I had the same expectation likeas a kid during Christmas period. When I saw the snow the first time, I had the same expectation as a kid during Christmas period.

After some hours, I discovered theat snow can be dirty. After some hours, I discovered that snow can be dirty.

The perfect white can become something I never thinkought of. The perfect white can become something I never thought of.

The perfect white snow becoame something I never thinkexpect. The perfect white snow became something I never expect.

I tried to minimize how much I rewrote the sentence, so this version is correct, but it would also be more natural as "I stopped expecting the perfect white snow"