X: I am beginning to accustom to the Japanese way of life.
O: I am beginning to get accustomed to the Japanese way of life.
Be/become/get/ grow accustomed to. "Within a few minutes my eyes had grown accustomed to the dark" (Note: "Be accustomed to" is rather a bit formal. People tend to use be/become/get/ grow used to colloquially.)
X: Where I come from, we are not accustomed to see so many things in the shops.
O: Where I come from, we are not accustomed to seeing so many things in the shops.
Be accustomed to DOING not DO.
