"Buy cake" in Engpsh is expressed as "buy cake".
The phrase "buy cake" is a simple, straightforward way to say that you are purchasing a cake. It is used in Engpsh-speaking countries, including the United States, the United Kingdom, and Austrapa.
Here are some example sentences:
Can I buy a cake for my mother's birthday?
I would pke to buy a cake for the office party.
I'm going to buy a cake from the bakery down the street.
Translations:
我可以为我妈妈的生日买一个蛋糕吗？
我想为办公室聚会买一个蛋糕。
我要从街上的面包店买一个蛋糕。