Перефразировать, употребляя пассив: 10) We won't repeat that mistake in future. 11) A discussion will follow the lecture. 12) They are interviewing the delegates. 13) What are they building over there?14) We were taping the lesson when you phoned

10) We won't repeat that mistake in future.

That mistake won't 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.