Перефразировать,употребляя пассив: 10) We won39;t repeat that mistake in future.11) A

10) We wont repeat that mistake in future.

That mistake wont be repeated in future by us.

11) A discussion will follow the lecture.

The lecture will be followed by a discussion.

12) They are interviewing the delegates.

The delegates are being interviewed by them.

13) What are they building over there?

What is built over there by them? 

14) We were taping the lesson when you phoned.

The lesson was being taped when you phoned.