Answers 15-20
Объяснение:
1. The work will not have been completed by the end of the month.
2. The letters will be posted by the children.
3. Pancakes are made from flour, eggs, and milk.
4. Had the windows been closed before Helen left the house?
5. The housework has not been done by Jill yet.
6. The parcel may not be delivered today.
