Is "any" really necessary in the following sentences? If I omit in the sentences will that be grammatical?
Here are some examples:
1- When I reached John's home, I heard the barking of dogs. I asked john if there are (any) dogs in his house because I am scared of dogs.
2- Are there (any) ghosts in the world? What's your opinion, John? I don't believe there are (any) ghosts in the world.
3- Are there (any) humans who are immortal and can do anything they want.