Rex ... four big bones. has или have?

Rex has four big bones. - У Рекса четыре большие кости.

We use has for the third person singular.

Rex doesn't have four big bones.

Does Rex have four big bones?

Who has four big bones?

How many bones does Rex have?

What does have Rex?

Does Rex or does Tom have four big bones?

Does Rex have four or seven big bones?

Does Rex have four big or small bones?

Does Rex have four big bones or tails?

Rex has four big bones, does not it?