1.books/are/on/there/bookshelf/many/the.

2.many/there/how/in/are/books/school bag/your?

3.television/the/there/a/living room/in/is

4.many/there/in/how/are/the/doors/classroom?

There is/there are

.....a desk in my room

.....green curtains in his room

......a sandwich on the table