Question

1)There is a television set in the living room
2)There are two armchairs in the room
3)There is a bed in my room
4)There are books in the bookshelves
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Answer 1

1) There was a television set in the living room 2) There were two chairs in the room 3) There was a bed in my room 4) There are books on the bookshelves

Answer 2

1)There was a television set in the living room
2)There were two armchairs in the room
3)There was a bed in my room
4)There were  books in the bookshelves

вместо is  ставим  was ( ед.ч.)
вместо  are  ставим  were (мн.ч.)