There are a lot of postcards on the table? задать вопрос

Are there a lot of postcards on the table?
Where are a lot of postcards?
There are a lot of postcards on the table? aren't they?
There are a lot of poscards or books on the table?

What postcards on the table?
Where are this postcards from?
Why this postcards on the table?
For what this postcards on the table?
What are you going to do with this postcards?