You need to buy some ballons and flowers.对buy提问You need to buy some ballons and flowers.否定句：一般疑问：反意疑问：对some ballons and flowers提问：对buy提问：
You need to buy some ballons and flowers.对buy提问
You need to buy some ballons and flowers.
否定句：
一般疑问：
反意疑问：
对some ballons and flowers提问：
对buy提问：
否定句：You needn't buy any ballons or flowers.
一般疑问：Do you need buy some ballons or flowers?
反意疑问：Don't you need buy some ballons or flowers?
对some ballons and flowers提问：what do you need/have to buy?
对buy提问：How do you get some ballons or flowers?
What do we need to buy first? What do we need to buy? 不过food是不可数名词，some可以修饰不可数名词、也可以修饰复数可数名词。 同理
You need to buy some ballons and flowers.
否定句：You needn't buy any ballons or flowers.
一般疑问：Do you need buy some ballons or flowers?
反意疑问：Don't you need buy some ballons or flowers?
对some ballons and flowers提问：what do you need/have to buy?
对buy提问：How do you get some ballons or flowers?