food,drink是不可数名词,没有复数
sport animal fruit指单个个体时,用单数,如The potato is a vegetable,not a fruit.马铃薯是一种蔬菜,不是一种水果.
An apple is a kind of fruit.苹果是一种水果.
A pig is a domestic animal.猪是一种家畜.
当集合名词时,用复数,比如:The animals like soprts.动物喜欢运动.
food,drink是不可数名词,没有复数
sport animal fruit指单个个体时,用单数,如The potato is a vegetable,not a fruit.马铃薯是一种蔬菜,不是一种水果.
An apple is a kind of fruit.苹果是一种水果.
A pig is a domestic animal.猪是一种家畜.
当集合名词时,用复数,比如:The animals like soprts.动物喜欢运动.