题目内容：

this is an apple and that is a 写出复数句.
this is an apple and that is a 写出复数句.上句中these或those做主语是be动词用（ ）,名词用（ this和that则用单数_.剧中的brothers是可数名词brotherde__形式英语中,名次分为单数和___名词.可数名词分为____名词和___名词.可数名词分为单数和__两种形式：表示一个人或物,名词用__形式.
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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...