this is an apple and that is a 写出复数句.
these are the apples and those are..
上句中these或those做主语是be动词用（are ）,名词用（复数）.this和that则用单数(apple).句中的brothers是可数名词brother的(复数)形式.
英语中,名词分为(单数)和(复数)名词.名词分为可数名词和不可数名词.可数名词分为单数和(复数)两种形式：表示一个人或物,名词用单数形式.
呼...题目有点乱呵...
this is an apple and that is a 写出复数句.
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