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Ответ:

1.They have been selling their flat in the sity.

2.They are moving to the country on March 12.

3.They have been buying a farm.

4.They have been getting a puppy.

5.They are taking their children to their new school on September 7.

6.They have been having a house-warming party.

Объяснение:

Формула Future Simple : предлог + глагол + ing-овое окончание,

Present Continuous : to have + been + глагол с ing окончанием,

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