What's is this или what's this. какое предложение составлено правельно?

What's is this - is a mistake. What's - what + is. The second is is odd

What's this. - is correct. - Что это?

This is a doll. - Это кукла.

This is a boy. - Это мальчик.

This is a book. - Это книга.

This is a cat. - Это кот.

This is a table. - Это стол.

This is a window. - Это окно.

Negative.

This is not a doll.

This is not a boy.

This is not a book.

This is not a cat.

This is not a table.

This is not a window.

Interrogative.

Is this a doll?

Is this a boy?

Is this a book?

Is this a cat?

Is this a table?

Is this a window?