Are these calendars?
Yes, they are.
Is this a window?
Yes, it is.
Is this a calendar?
Yes, it is.
Is this a paper clip?
Yes, it is.
Is this a calendar?
No, it's a workbook.
Is this a window?
No, it isn't. It's a pencil sharpener.
Are these doors?
Yes, they are.
Are these doors?
No, they aren't. They are clocks.
Is this a picture?
No, it isn't. It's a clock.
Are these pencil sharpeners?
No, they aren't. They are paper clips.
Is this a picture?
Yes, it is.
Are these windows?
Yes, they are.