she is a nurse改成负数

Question

she is nurse (改为复数）
What are those over there?(改为单数）
These are apples and those are pineapples(改为单数)
They are waitresses (改为单数)
They are oranges (改为单数)
They are apples (改为单数)

Answer 1

They are nurses.
What is that over there?
This is an apple and that is pineapple.
He is a waitress.
It is an orange.
It is an apple.