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.
只填一下空就可以。