there are in this class 20 students,the background of them d

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there are in this class 20 students,the background of them different分析一下这个句子
是独立主格结构吗,

There are in this class 20 students,the background of them different.是独立主格结构,There be 句型表示“某地有某物”,后面的名词是句子的主语,就是说：该句的主语是20 students；逗号后的主语是名词the background of them,与前边的主语不同,其后加形容词different,相对于前半句,共同构成了独立主格结构
再问：那为什么不是the background of them are different
再答：英语中的完整句子要么是简单句，要么是复合句，要么是并列句。如果在逗号后加上表示前后两个是并列句的连词就可以了，如and,否则还是原来的样子是正确的！希望我解释的比较清楚

there are in this class 20 students,the background of them d - There are twenty-eight students in the class.Ten of them a There are 20 students in our class.10 of them are playing fo There are 40students in our class and 20 of them watched mat Of all the 40 students in this class,20 students are girls,2 There are 40 students in my class.18 of them are boys,and th There are thirty students in our class.（）of them are league There are forty students in their class.Ten of them are girl 25.There are thirty students in our class.（）of them are lea There are nineteen students in my class and n() of them are 七年级英语阅读题There are sixty students in our class.Two of them ar there are 40 students in our class and two fifths of them __