1.
This is a very difficult text; the text has no clear meaning.
2.
There is a book on the table; the book has a bright cover.
3.
He has a collection of post stamps; the collection is very rich.
4.
It is a difficult problem; the problem is not solved yet.
5.
She has a son and a daughter; the children don't go to school.
6.
There is a letter for you in the letter-box; the letter has been brought by a
post-man.