I want to buy food.

我想买食物。

I want to buy a book.

我想买一本书。

Is Helen going to buy?

海伦要买东西吗？

What do you want to buy?

你想买什么？

I need to buy some soap.

我需要买些肥皂。

I need to buy furniture.

我需要买家具。

I want to buy some food.

我想买一些食物。

Would you like to buy it?

你想买它吗？

I want to buy a postcard.

我想买一张明信片。

What are they going to buy?

他们打算买什么？