buatlah kalimat negative positive dari kata there is dan there are

1.(+)There is a carpet
(-)There is not a carpet
2.(+)There are two books
(-)There are not two books

positive sentences:
-there is a cupboard in the classroom(+)
-there are ten tables and chairs in the classroom(+)

negative sentences:
-is there not a bear(-)
-are there not three ants(-)

interogative sentences:
-there is a security?(?)
-there are nine student?(?)

sorry if my answer is wrong