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,

how many days are there in this There are t_____days in February this year. there are()()() books in this room there are many e__ in this book. There are no messages in this folder There are two mistakes in this sentense.What are they? There are two mistakes in this sentenes.What are they? There are three t____in a year in this school. There are _____(three) floors in this building. There are at l____ 1000 workers in this factory. there are some big rooms in this hotel一般疑问句 fish there in are many lake this连词成句 There are _____of people in this small twon别瞎打 There are some computers in this school改为否定句 How many ____ (read ) rooms are there in this building There are the____(many) pandas in this zoo how many day are there in this month There are many kinds of delicious food in this r______