Http://english-ginter.org.ua/2012/10/27/irregular_verbs/
The donkey seller-Продавец осла
<span>Benjamin
Franklin is acknowledged to have invented a means of protection against
the disastrous effects of lightning the lightning rod. Franklin's
theory at first seemed to be misunderstood both in his country and
abroad. It is known to have been severely attacked by the leader of
French scientists Abbé Nollet. Franklin is recognized to have been a
great public figure who did as much as he could for the good of his
country. He is known to have been the editor of one of the newspapers
enjoying a great popularity with his countrymen. He is sure to be one of
the broadest as well as one of the most creative minds of his time.
</span>
1. We haven't just written twenty letters. Have we just written twenty letters?
2.Her friends didn't forget the present. Did her friends forget the present?
3. I haven't already chosen a new dress. Have you already chosen a new dress?
4.The mother didn't feed her child. Did the mother feed her child?
5.They haven't spent this days together. Have they spent this days together?