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81) I saw my friends to leave.
2) I had learnt all the words by six o'clock on Sunday .
3) I thought he had written to you.
4) We didn't know that the text had been changed.
5) She completed the report by eight o'clock.
6) Who finished his job by Monday?
I finished the job by Monday.
7) She knew I had been talking to her father.
8) He said told me he saw Nick three weeks ago.
9) She thanked me for what I had done for her.
10) They woke up after the alarm clock rang.
11) After you left, I went to bed .
12) We asked him about the countries he had visited.
13) In England he recollected the grammar rules that he had learnt.
14) He took the money after I had asked him to do that.