Re: What is in the basket?
You could say "Some apples are in the basket" but you can't shorten it to your version. You can just say "Some apples".
Q: Who is going to the party?
A: We are.
(You don't have to say "We are going to the party".)
You will also hear "Us" as an answer to that question.
Q: What are the most dangerous animals in the jungle?
A: Tigers are.
However, with questions like "What is in ...", you don't use the form of "to be".
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.