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10) The concert (to be) a greater success than we (to expect).
11) We could not go out because it (to rain) hard since early morning.
12) What you (to do) when I (to come) in ?
13) When I (to come) to his house , they (to tell) me that he (to leave) an hour before.
14) Before  I (to come) he (to study) physics for 2 hours.
15) I (to try) to find my old exercise book for 20 minutes , when you (to come).
16) At last the librarian (to give) me the book which I (to wait) for during 2 months.

10) The concert was a greater success than we had expected.11) We could not go out because it had been raining hard since early morning.12) What were you doing when I came in?13) When I came to his house, they told me that he had left an hour before.14) Before I came he had been studying physics for 2 hours.15) I had been trying to find my old exercise book for 20 minutes, when you came.16) At last the librarian gave me the book which I had been waiting for during 2 months.